31012121311 has 4 divisors (see below), whose sum is σ = 31448911824. Its totient is φ = 30575330800.

The previous prime is 31012121303. The next prime is 31012121351. The reversal of 31012121311 is 11312121013.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 31012121311 - 2³ = 31012121303 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31012121351) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 218395150 + ... + 218395291.

It is an arithmetic number, because the mean of its divisors is an integer number (7862227956).

Almost surely, 2^31012121311 is an apocalyptic number.

31012121311 is a deficient number, since it is larger than the sum of its proper divisors (436790513).

31012121311 is an equidigital number, since it uses as much as digits as its factorization.

31012121311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 436790512.

The product of its (nonzero) digits is 36, while the sum is 16.

Adding to 31012121311 its reverse (11312121013), we get a palindrome (42324242324).

The spelling of 31012121311 in words is "thirty-one billion, twelve million, one hundred twenty-one thousand, three hundred eleven".