1551317596391 has 4 divisors (see below), whose sum is σ = 1553562629784. Its totient is φ = 1549072563000.

The previous prime is 1551317596349. The next prime is 1551317596447. The reversal of 1551317596391 is 1936957131551.

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 1551317596391 - 2⁶ = 1551317596327 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 (1551317596291) 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, 1122515660 + ... + 1122517041.

It is an arithmetic number, because the mean of its divisors is an integer number (388390657446).

Almost surely, 2^{1551317596391} is an apocalyptic number.

1551317596391 is a deficient number, since it is larger than the sum of its proper divisors (2245033393).

1551317596391 is an equidigital number, since it uses as much as digits as its factorization.

1551317596391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2245033392.

The product of its digits is 3827250, while the sum is 56.

The spelling of 1551317596391 in words is "one trillion, five hundred fifty-one billion, three hundred seventeen million, five hundred ninety-six thousand, three hundred ninety-one".