391372597087 has 4 divisors (see below), whose sum is σ = 394360174296. Its totient is φ = 388385019880.

The previous prime is 391372597027. The next prime is 391372597103. The reversal of 391372597087 is 780795273193.

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

It is a cyclic number.

It is not a de Polignac number, because 391372597087 - 2⁷ = 391372596959 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 (391372597027) 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, 1493788408 + ... + 1493788669.

It is an arithmetic number, because the mean of its divisors is an integer number (98590043574).

Almost surely, 2^391372597087 is an apocalyptic number.

391372597087 is a deficient number, since it is larger than the sum of its proper divisors (2987577209).

391372597087 is a wasteful number, since it uses less digits than its factorization.

391372597087 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2987577208.

The product of its (nonzero) digits is 20003760, while the sum is 61.

The spelling of 391372597087 in words is "three hundred ninety-one billion, three hundred seventy-two million, five hundred ninety-seven thousand, eighty-seven".