1397371551 has 4 divisors (see below), whose sum is σ = 1863162072. Its totient is φ = 931581032.

The previous prime is 1397371543. The next prime is 1397371561. The reversal of 1397371551 is 1551737931.

1397371551 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

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 1397371551 - 2³ = 1397371543 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1397371501) 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, 232895256 + ... + 232895261.

It is an arithmetic number, because the mean of its divisors is an integer number (465790518).

Almost surely, 2^1397371551 is an apocalyptic number.

1397371551 is a deficient number, since it is larger than the sum of its proper divisors (465790521).

1397371551 is an equidigital number, since it uses as much as digits as its factorization.

1397371551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 465790520.

The product of its digits is 99225, while the sum is 42.

The square root of 1397371551 is about 37381.4332389757. The cubic root of 1397371551 is about 1117.9884042414.

The spelling of 1397371551 in words is "one billion, three hundred ninety-seven million, three hundred seventy-one thousand, five hundred fifty-one".