31278304945921 has 8 divisors (see below), whose sum is σ = 35043997679424. Its totient is φ = 27666313956720.

The previous prime is 31278304945891. The next prime is 31278304945933. The reversal of 31278304945921 is 12954940387213.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 31278304945921 - 2³³ = 31269715011329 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31278304045921) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 38425435645 + ... + 38425436458.

It is an arithmetic number, because the mean of its divisors is an integer number (4380499709928).

Almost surely, 2^{31278304945921} is an apocalyptic number.

It is an amenable number.

31278304945921 is a deficient number, since it is larger than the sum of its proper divisors (3765692733503).

31278304945921 is a wasteful number, since it uses less digits than its factorization.

31278304945921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76850872151.

The product of its (nonzero) digits is 13063680, while the sum is 58.

The spelling of 31278304945921 in words is "thirty-one trillion, two hundred seventy-eight billion, three hundred four million, nine hundred forty-five thousand, nine hundred twenty-one".