1311951942 has 24 divisors (see below), whose sum is σ = 3248643216. Its totient is φ = 374843376.

The previous prime is 1311951941. The next prime is 1311951959. The reversal of 1311951942 is 2491591131.

1311951942 is a `hidden beast` number, since 131 + 1 + 9 + 519 + 4 + 2 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 1311951897 and 1311951906.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1311951941) 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, 5206033 + ... + 5206284.

It is an arithmetic number, because the mean of its divisors is an integer number (135360134).

Almost surely, 2^1311951942 is an apocalyptic number.

1311951942 is an abundant number, since it is smaller than the sum of its proper divisors (1936691274).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1311951942 is a wasteful number, since it uses less digits than its factorization.

1311951942 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10412332 (or 10412329 counting only the distinct ones).

The product of its digits is 9720, while the sum is 36.

The square root of 1311951942 is about 36220.8771566896. The cubic root of 1311951942 is about 1094.7273681679.

The spelling of 1311951942 in words is "one billion, three hundred eleven million, nine hundred fifty-one thousand, nine hundred forty-two".