1391164402 has 4 divisors (see below), whose sum is σ = 2086746606. Its totient is φ = 695582200.

The previous prime is 1391164391. The next prime is 1391164427. The reversal of 1391164402 is 2044611931.

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

It can be written as a sum of positive squares in only one way, i.e., 1382278041 + 8886361 = 37179^2 + 2981^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 347791099 + ... + 347791102.

Almost surely, 2^1391164402 is an apocalyptic number.

1391164402 is a deficient number, since it is larger than the sum of its proper divisors (695582204).

1391164402 is an equidigital number, since it uses as much as digits as its factorization.

1391164402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 695582203.

The product of its (nonzero) digits is 5184, while the sum is 31.

The square root of 1391164402 is about 37298.3163426984. The cubic root of 1391164402 is about 1116.3305723903.

The spelling of 1391164402 in words is "one billion, three hundred ninety-one million, one hundred sixty-four thousand, four hundred two".