1316531970 has 144 divisors (see below), whose sum is σ = 3747610152. Its totient is φ = 320486400.

The previous prime is 1316531873. The next prime is 1316531987. The reversal of 1316531970 is 791356131.

1316531970 is a `hidden beast` number, since 1 + 31 + 6 + 531 + 97 + 0 = 666.

It can be written as a sum of positive squares in 12 ways, for example, as 280529001 + 1036002969 = 16749^2 + 32187^2 .

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 1535782 + ... + 1536638.

Almost surely, 2^1316531970 is an apocalyptic number.

1316531970 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 1316531970, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1873805076).

1316531970 is an abundant number, since it is smaller than the sum of its proper divisors (2431078182).

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

1316531970 is a wasteful number, since it uses less digits than its factorization.

1316531970 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 997 (or 981 counting only the distinct ones).

The product of its (nonzero) digits is 17010, while the sum is 36.

The square root of 1316531970 is about 36284.0456674831. The cubic root of 1316531970 is about 1095.9997874376. Note that the first 3 decimals are identical.

The spelling of 1316531970 in words is "one billion, three hundred sixteen million, five hundred thirty-one thousand, nine hundred seventy".