1313381661 has 8 divisors (see below), whose sum is σ = 1751680224. Its totient is φ = 875335440.

The previous prime is 1313381651. The next prime is 1313381701. The reversal of 1313381661 is 1661833131.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1313381661 - 2¹⁰ = 1313380637 is a prime.

It is a super-2 number, since 2×1313381661² = 3449942774902237842, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1313381611) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 50586 + ... + 72011.

It is an arithmetic number, because the mean of its divisors is an integer number (218960028).

Almost surely, 2^1313381661 is an apocalyptic number.

It is an amenable number.

1313381661 is a deficient number, since it is larger than the sum of its proper divisors (438298563).

1313381661 is a wasteful number, since it uses less digits than its factorization.

1313381661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 126171.

The product of its digits is 7776, while the sum is 33.

The square root of 1313381661 is about 36240.6079005306. The cubic root of 1313381661 is about 1095.1248889059.

The spelling of 1313381661 in words is "one billion, three hundred thirteen million, three hundred eighty-one thousand, six hundred sixty-one".