31606990361 has 4 divisors (see below), whose sum is σ = 31746228432. Its totient is φ = 31467752292.

The previous prime is 31606990313. The next prime is 31606990369. The reversal of 31606990361 is 16309960613.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31606990361 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31606990369) 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, 69618695 + ... + 69619148.

It is an arithmetic number, because the mean of its divisors is an integer number (7936557108).

Almost surely, 2^31606990361 is an apocalyptic number.

It is an amenable number.

31606990361 is a deficient number, since it is larger than the sum of its proper divisors (139238071).

31606990361 is a wasteful number, since it uses less digits than its factorization.

31606990361 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 139238070.

The product of its (nonzero) digits is 157464, while the sum is 44.

The spelling of 31606990361 in words is "thirty-one billion, six hundred six million, nine hundred ninety thousand, three hundred sixty-one".