1313821881 has 24 divisors (see below), whose sum is σ = 1961546496. Its totient is φ = 846508320.

The previous prime is 1313821877. The next prime is 1313821909. The reversal of 1313821881 is 1881283131.

It is not a de Polignac number, because 1313821881 - 2² = 1313821877 is a prime.

It is a super-2 number, since 2×1313821881² = 3452255869988756322, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1313821811) by changing a digit.

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, 243691 + ... + 249023.

It is an arithmetic number, because the mean of its divisors is an integer number (81731104).

Almost surely, 2^1313821881 is an apocalyptic number.

It is an amenable number.

1313821881 is a deficient number, since it is larger than the sum of its proper divisors (647724615).

1313821881 is a wasteful number, since it uses less digits than its factorization.

1313821881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6253 (or 6250 counting only the distinct ones).

The product of its digits is 9216, while the sum is 36.

The square root of 1313821881 is about 36246.6809652967. The cubic root of 1313821881 is about 1095.2472300958.

The spelling of 1313821881 in words is "one billion, three hundred thirteen million, eight hundred twenty-one thousand, eight hundred eighty-one".