1316581980 has 72 divisors (see below), whose sum is σ = 4288305168. Its totient is φ = 300932352.

The previous prime is 1316581979. The next prime is 1316582011. The reversal of 1316581980 is 891856131.

It is a super-2 number, since 2×1316581980² = 3466776220121440800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 220969 + ... + 226848.

It is an arithmetic number, because the mean of its divisors is an integer number (59559794).

Almost surely, 2^1316581980 is an apocalyptic number.

1316581980 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1316581980 is an abundant number, since it is smaller than the sum of its proper divisors (2971723188).

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

1316581980 is a wasteful number, since it uses less digits than its factorization.

1316581980 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 447843 (or 447834 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 42.

The square root of 1316581980 is about 36284.7348068027. The cubic root of 1316581980 is about 1096.0136648713.

The spelling of 1316581980 in words is "one billion, three hundred sixteen million, five hundred eighty-one thousand, nine hundred eighty".