31136331161 has 4 divisors (see below), whose sum is σ = 33531433572. Its totient is φ = 28741228752.

The previous prime is 31136331097. The next prime is 31136331179. The reversal of 31136331161 is 16113363113.

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

It can be written as a sum of positive squares in 2 ways, for example, as 3203560000 + 27932771161 = 56600^2 + 167131^2 .

It is a cyclic number.

It is not a de Polignac number, because 31136331161 - 2⁶ = 31136331097 is a prime.

It is a super-2 number, since 2×31136331161² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (31136331461) 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, 1197551186 + ... + 1197551211.

It is an arithmetic number, because the mean of its divisors is an integer number (8382858393).

Almost surely, 2^31136331161 is an apocalyptic number.

It is an amenable number.

31136331161 is a deficient number, since it is larger than the sum of its proper divisors (2395102411).

31136331161 is a wasteful number, since it uses less digits than its factorization.

31136331161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2395102410.

The product of its digits is 2916, while the sum is 29.

Adding to 31136331161 its reverse (16113363113), we get a palindrome (47249694274).

The spelling of 31136331161 in words is "thirty-one billion, one hundred thirty-six million, three hundred thirty-one thousand, one hundred sixty-one".