311640520361 has 4 divisors (see below), whose sum is σ = 312642580224. Its totient is φ = 310638460500.

The previous prime is 311640520349. The next prime is 311640520393. The reversal of 311640520361 is 163025046113.

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, and also an emirpimes, since its reverse is a distinct semiprime: 163025046113 = 27197 ⋅5994229.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-311640520361 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (311640520861) 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, 501029465 + ... + 501030086.

It is an arithmetic number, because the mean of its divisors is an integer number (78160645056).

Almost surely, 2^311640520361 is an apocalyptic number.

It is an amenable number.

311640520361 is a deficient number, since it is larger than the sum of its proper divisors (1002059863).

311640520361 is a wasteful number, since it uses less digits than its factorization.

311640520361 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1002059862.

The product of its (nonzero) digits is 12960, while the sum is 32.

Adding to 311640520361 its reverse (163025046113), we get a palindrome (474665566474).

The spelling of 311640520361 in words is "three hundred eleven billion, six hundred forty million, five hundred twenty thousand, three hundred sixty-one".