31365890369 has 4 divisors (see below), whose sum is σ = 34217334960. Its totient is φ = 28514445780.

The previous prime is 31365890351. The next prime is 31365890389. The reversal of 31365890369 is 96309856313.

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 not a de Polignac number, because 31365890369 - 2⁸ = 31365890113 is a prime.

It is a super-2 number, since 2×31365890369² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 31365890369.

It is not an unprimeable number, because it can be changed into a prime (31365890329) 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, 1425722279 + ... + 1425722300.

It is an arithmetic number, because the mean of its divisors is an integer number (8554333740).

Almost surely, 2^31365890369 is an apocalyptic number.

It is an amenable number.

31365890369 is a deficient number, since it is larger than the sum of its proper divisors (2851444591).

31365890369 is a wasteful number, since it uses less digits than its factorization.

31365890369 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2851444590.

The product of its (nonzero) digits is 3149280, while the sum is 53.

The spelling of 31365890369 in words is "thirty-one billion, three hundred sixty-five million, eight hundred ninety thousand, three hundred sixty-nine".