1313660621 has 32 divisors (see below), whose sum is σ = 1671952128. Its totient is φ = 1004451840.

The previous prime is 1313660611. The next prime is 1313660651. The reversal of 1313660621 is 1260663131.

It is a happy number.

It is not a de Polignac number, because 1313660621 - 2¹⁰ = 1313659597 is a prime.

It is a super-2 number, since 2×1313660621² = 3451408454332211282, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1313660611) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 377831 + ... + 381291.

It is an arithmetic number, because the mean of its divisors is an integer number (52248504).

Almost surely, 2^1313660621 is an apocalyptic number.

It is an amenable number.

1313660621 is a deficient number, since it is larger than the sum of its proper divisors (358291507).

1313660621 is a wasteful number, since it uses less digits than its factorization.

1313660621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3621.

The product of its (nonzero) digits is 3888, while the sum is 29.

The square root of 1313660621 is about 36244.4564174992. The cubic root of 1313660621 is about 1095.2024176298.

The spelling of 1313660621 in words is "one billion, three hundred thirteen million, six hundred sixty thousand, six hundred twenty-one".