31042521261 has 12 divisors (see below), whose sum is σ = 45136147680. Its totient is φ = 20557960200.

The previous prime is 31042521259. The next prime is 31042521277. The reversal of 31042521261 is 16212524013.

31042521261 is a `hidden beast` number, since 310 + 42 + 52 + 1 + 261 = 666.

It is not a de Polignac number, because 31042521261 - 2¹ = 31042521259 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31042521221) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 11419731 + ... + 11422448.

It is an arithmetic number, because the mean of its divisors is an integer number (3761345640).

Almost surely, 2^31042521261 is an apocalyptic number.

It is an amenable number.

31042521261 is a deficient number, since it is larger than the sum of its proper divisors (14093626419).

31042521261 is a wasteful number, since it uses less digits than its factorization.

31042521261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22842336 (or 22842333 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 27.

The spelling of 31042521261 in words is "thirty-one billion, forty-two million, five hundred twenty-one thousand, two hundred sixty-one".