31219430399 has 4 divisors (see below), whose sum is σ = 31406373264. Its totient is φ = 31032487536.

The previous prime is 31219430329. The next prime is 31219430419. The reversal of 31219430399 is 99303491213.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31219430399 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31219430329) 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, 93471182 + ... + 93471515.

It is an arithmetic number, because the mean of its divisors is an integer number (7851593316).

Almost surely, 2^31219430399 is an apocalyptic number.

31219430399 is a deficient number, since it is larger than the sum of its proper divisors (186942865).

31219430399 is a wasteful number, since it uses less digits than its factorization.

31219430399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 186942864.

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

The spelling of 31219430399 in words is "thirty-one billion, two hundred nineteen million, four hundred thirty thousand, three hundred ninety-nine".