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31442240111 = 82138297491
BaseRepresentation
bin11101010010000110…
…101000001001101111
310000011021010021212112
4131102012220021233
51003343203140421
622235552154235
72162111426342
oct352206501157
9100137107775
1031442240111
1112375363407
126115b3897b
132c71112c09
141743bd4459
15c4056445b
hex7521a826f

31442240111 has 4 divisors (see below), whose sum is σ = 31480538424. Its totient is φ = 31403941800.

The previous prime is 31442240059. The next prime is 31442240113. The reversal of 31442240111 is 11104224413.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2k-31442240111 is a prime.

It is a super-2 number, since 2×314422401112 (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31442240113) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19147925 + ... + 19149566.

It is an arithmetic number, because the mean of its divisors is an integer number (7870134606).

Almost surely, 231442240111 is an apocalyptic number.

31442240111 is a deficient number, since it is larger than the sum of its proper divisors (38298313).

31442240111 is an equidigital number, since it uses as much as digits as its factorization.

31442240111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38298312.

The product of its (nonzero) digits is 768, while the sum is 23.

Adding to 31442240111 its reverse (11104224413), we get a palindrome (42546464524).

The spelling of 31442240111 in words is "thirty-one billion, four hundred forty-two million, two hundred forty thousand, one hundred eleven".

Divisors: 1 821 38297491 31442240111