1388165131 has 4 divisors (see below), whose sum is σ = 1388317000. Its totient is φ = 1388013264.

The previous prime is 1388165083. The next prime is 1388165147. The reversal of 1388165131 is 1315618831.

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 1388165131 - 2⁹ = 1388164619 is a prime.

It is a super-2 number, since 2×1388165131² = 3854004861848494322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1388165171) 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, 61281 + ... + 80818.

It is an arithmetic number, because the mean of its divisors is an integer number (347079250).

Almost surely, 2^1388165131 is an apocalyptic number.

1388165131 is a deficient number, since it is larger than the sum of its proper divisors (151869).

1388165131 is an equidigital number, since it uses as much as digits as its factorization.

1388165131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 151868.

The product of its digits is 17280, while the sum is 37.

The square root of 1388165131 is about 37258.0881286198. The cubic root of 1388165131 is about 1115.5277468451.

The spelling of 1388165131 in words is "one billion, three hundred eighty-eight million, one hundred sixty-five thousand, one hundred thirty-one".