1316991042 has 128 divisors (see below), whose sum is σ = 3251404800. Its totient is φ = 393465600.

The previous prime is 1316991041. The next prime is 1316991059. The reversal of 1316991042 is 2401996131.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 1316990988 and 1316991006.

It is not an unprimeable number, because it can be changed into a prime (1316991041) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1494442 + ... + 1495322.

It is an arithmetic number, because the mean of its divisors is an integer number (25401600).

Almost surely, 2^1316991042 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1316991042, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1625702400).

1316991042 is an abundant number, since it is smaller than the sum of its proper divisors (1934413758).

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

1316991042 is a wasteful number, since it uses less digits than its factorization.

1316991042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 989 (or 983 counting only the distinct ones).

The product of its (nonzero) digits is 11664, while the sum is 36.

The square root of 1316991042 is about 36290.3712022900. The cubic root of 1316991042 is about 1096.1271635934.

The spelling of 1316991042 in words is "one billion, three hundred sixteen million, nine hundred ninety-one thousand, forty-two".