1371391855 has 4 divisors (see below), whose sum is σ = 1645670232. Its totient is φ = 1097113480.

The previous prime is 1371391841. The next prime is 1371391871. The reversal of 1371391855 is 5581931731.

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

It is not a de Polignac number, because 1371391855 - 2⁷ = 1371391727 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 137139181 + ... + 137139190.

It is an arithmetic number, because the mean of its divisors is an integer number (411417558).

Almost surely, 2^1371391855 is an apocalyptic number.

1371391855 is a deficient number, since it is larger than the sum of its proper divisors (274278377).

1371391855 is an equidigital number, since it uses as much as digits as its factorization.

1371391855 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 274278376.

The product of its digits is 113400, while the sum is 43.

The square root of 1371391855 is about 37032.3082591404. The cubic root of 1371391855 is about 1111.0165335405.

The spelling of 1371391855 in words is "one billion, three hundred seventy-one million, three hundred ninety-one thousand, eight hundred fifty-five".