1311957 has 12 divisors (see below), whose sum is σ = 1965600. Its totient is φ = 874476.

The previous prime is 1311923. The next prime is 1311967. The reversal of 1311957 is 7591131.

It is a happy number.

It is not a de Polignac number, because 1311957 - 2⁷ = 1311829 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

1311957 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 1311957.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1311917) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2457 + ... + 2942.

It is an arithmetic number, because the mean of its divisors is an integer number (163800).

2^1311957 is an apocalyptic number.

It is an amenable number.

1311957 is a deficient number, since it is larger than the sum of its proper divisors (653643).

1311957 is an frugal number, since it uses more digits than its factorization.

1311957 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5414 (or 5402 counting only the distinct ones).

The product of its digits is 945, while the sum is 27.

The square root of 1311957 is about 1145.4069145941. The cubic root of 1311957 is about 109.4728775009.

The spelling of 1311957 in words is "one million, three hundred eleven thousand, nine hundred fifty-seven".