31000131301243 has 4 divisors (see below), whose sum is σ = 33384756785968. Its totient is φ = 28615505816520.

The previous prime is 31000131301219. The next prime is 31000131301253. The reversal of 31000131301243 is 34210313100013.

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 31000131301243 - 2¹⁷ = 31000131170171 is a prime.

It is a super-2 number, since 2×31000131301243² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31000131301253) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1192312742343 + ... + 1192312742368.

It is an arithmetic number, because the mean of its divisors is an integer number (8346189196492).

Almost surely, 2^{31000131301243} is an apocalyptic number.

31000131301243 is a deficient number, since it is larger than the sum of its proper divisors (2384625484725).

31000131301243 is a wasteful number, since it uses less digits than its factorization.

31000131301243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2384625484724.

The product of its (nonzero) digits is 648, while the sum is 22.

Adding to 31000131301243 its reverse (34210313100013), we get a palindrome (65210444401256).

The spelling of 31000131301243 in words is "thirty-one trillion, one hundred thirty-one million, three hundred one thousand, two hundred forty-three".