1316492621 has 4 divisors (see below), whose sum is σ = 1318081500. Its totient is φ = 1314903744.

The previous prime is 1316492609. The next prime is 1316492623. The reversal of 1316492621 is 1262946131.

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

It can be written as a sum of positive squares in 2 ways, for example, as 937216996 + 379275625 = 30614^2 + 19475^2 .

It is a cyclic number.

It is not a de Polignac number, because 1316492621 - 2²⁶ = 1249383757 is a prime.

It is a super-2 number, since 2×1316492621² = 3466305642294899282, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1316492623) 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, 793196 + ... + 794853.

It is an arithmetic number, because the mean of its divisors is an integer number (329520375).

Almost surely, 2^1316492621 is an apocalyptic number.

It is an amenable number.

1316492621 is a deficient number, since it is larger than the sum of its proper divisors (1588879).

1316492621 is an equidigital number, since it uses as much as digits as its factorization.

1316492621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1588878.

The product of its digits is 15552, while the sum is 35.

The square root of 1316492621 is about 36283.5034278665. The cubic root of 1316492621 is about 1095.9888681116.

The spelling of 1316492621 in words is "one billion, three hundred sixteen million, four hundred ninety-two thousand, six hundred twenty-one".