31897395361 has 8 divisors (see below), whose sum is σ = 34355326824. Its totient is φ = 29440076160.

The previous prime is 31897395349. The next prime is 31897395391. The reversal of 31897395361 is 16359379813.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 51208336 + 31846187025 = 7156^2 + 178455^2 .

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 31897395361 - 2¹¹ = 31897393313 is a prime.

It is not an unprimeable number, because it can be changed into a prime (31897395331) 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, 41860 + ... + 256021.

It is an arithmetic number, because the mean of its divisors is an integer number (4294415853).

Almost surely, 2^31897395361 is an apocalyptic number.

It is an amenable number.

31897395361 is a deficient number, since it is larger than the sum of its proper divisors (2457931463).

31897395361 is a wasteful number, since it uses less digits than its factorization.

31897395361 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 306131.

The product of its digits is 3674160, while the sum is 55.

The spelling of 31897395361 in words is "thirty-one billion, eight hundred ninety-seven million, three hundred ninety-five thousand, three hundred sixty-one".