1313820661 has 4 divisors (see below), whose sum is σ = 1314085824. Its totient is φ = 1313555500.

The previous prime is 1313820653. The next prime is 1313820713. The reversal of 1313820661 is 1660283131.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1313820661 - 2³ = 1313820653 is a prime.

It is a super-2 number, since 2×1313820661² = 3452249458540953842, 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 (1313823661) 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, 125005 + ... + 135106.

It is an arithmetic number, because the mean of its divisors is an integer number (328521456).

Almost surely, 2^1313820661 is an apocalyptic number.

It is an amenable number.

1313820661 is a deficient number, since it is larger than the sum of its proper divisors (265163).

1313820661 is an equidigital number, since it uses as much as digits as its factorization.

1313820661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 265162.

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

The square root of 1313820661 is about 36246.6641361657. The cubic root of 1313820661 is about 1095.2468910843.

The spelling of 1313820661 in words is "one billion, three hundred thirteen million, eight hundred twenty thousand, six hundred sixty-one".