31072265261 has 8 divisors (see below), whose sum is σ = 31916880504. Its totient is φ = 30227904000.

The previous prime is 31072265243. The next prime is 31072265317. The reversal of 31072265261 is 16256227013.

It can be written as a sum of positive squares in 4 ways, for example, as 17075955625 + 13996309636 = 130675^2 + 118306^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 31072265261 - 2⁶ = 31072265197 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31072285261) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 199061 + ... + 319013.

It is an arithmetic number, because the mean of its divisors is an integer number (3989610063).

Almost surely, 2^31072265261 is an apocalyptic number.

It is an amenable number.

31072265261 is a deficient number, since it is larger than the sum of its proper divisors (844615243).

31072265261 is a wasteful number, since it uses less digits than its factorization.

31072265261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 126991.

The product of its (nonzero) digits is 30240, while the sum is 35.

The spelling of 31072265261 in words is "thirty-one billion, seventy-two million, two hundred sixty-five thousand, two hundred sixty-one".