31444400399 has 4 divisors (see below), whose sum is σ = 31546825464. Its totient is φ = 31341975336.

The previous prime is 31444400347. The next prime is 31444400411. The reversal of 31444400399 is 99300444413.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 99300444413 = 569 ⋅174517477.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31444400399 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 (31444402399) 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, 51212072 + ... + 51212685.

It is an arithmetic number, because the mean of its divisors is an integer number (7886706366).

Almost surely, 2^31444400399 is an apocalyptic number.

31444400399 is a deficient number, since it is larger than the sum of its proper divisors (102425065).

31444400399 is a wasteful number, since it uses less digits than its factorization.

31444400399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 102425064.

The product of its (nonzero) digits is 186624, while the sum is 41.

The spelling of 31444400399 in words is "thirty-one billion, four hundred forty-four million, four hundred thousand, three hundred ninety-nine".