391474438523 has 16 divisors (see below), whose sum is σ = 471188640000. Its totient is φ = 317725703712.

The previous prime is 391474438507. The next prime is 391474438529. The reversal of 391474438523 is 325834474193.

It is a cyclic number.

It is not a de Polignac number, because 391474438523 - 2⁴ = 391474438507 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (391474438529) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 495893 + ... + 1014326.

It is an arithmetic number, because the mean of its divisors is an integer number (29449290000).

Almost surely, 2^391474438523 is an apocalyptic number.

391474438523 is a deficient number, since it is larger than the sum of its proper divisors (79714201477).

391474438523 is a wasteful number, since it uses less digits than its factorization.

391474438523 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1512194.

The product of its digits is 8709120, while the sum is 53.

The spelling of 391474438523 in words is "three hundred ninety-one billion, four hundred seventy-four million, four hundred thirty-eight thousand, five hundred twenty-three".