1313961391 has 4 divisors (see below), whose sum is σ = 1326241512. Its totient is φ = 1301681272.

The previous prime is 1313961371. The next prime is 1313961409. The reversal of 1313961391 is 1931693131.

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

It is a cyclic number.

It is not a de Polignac number, because 1313961391 - 2¹⁷ = 1313830319 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1313961391.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1313961361) 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, 6139900 + ... + 6140113.

It is an arithmetic number, because the mean of its divisors is an integer number (331560378).

Almost surely, 2^1313961391 is an apocalyptic number.

1313961391 is a deficient number, since it is larger than the sum of its proper divisors (12280121).

1313961391 is a wasteful number, since it uses less digits than its factorization.

1313961391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12280120.

The product of its digits is 13122, while the sum is 37.

The square root of 1313961391 is about 36248.6053662758. The cubic root of 1313961391 is about 1095.2859955061.

The spelling of 1313961391 in words is "one billion, three hundred thirteen million, nine hundred sixty-one thousand, three hundred ninety-one".