1381879531 has 2 divisors, whose sum is σ = 1381879532. Its totient is φ = 1381879530.

The previous prime is 1381879511. The next prime is 1381879567. The reversal of 1381879531 is 1359781831.

It is a weak prime.

It is an emirp because it is prime and its reverse (1359781831) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1381879531 - 2⁷ = 1381879403 is a prime.

It is a super-2 number, since 2×1381879531² = 3819182076393559922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1381879511) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 690939765 + 690939766.

It is an arithmetic number, because the mean of its divisors is an integer number (690939766).

Almost surely, 2^1381879531 is an apocalyptic number.

1381879531 is a deficient number, since it is larger than the sum of its proper divisors (1).

1381879531 is an equidigital number, since it uses as much as digits as its factorization.

1381879531 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 181440, while the sum is 46.

The square root of 1381879531 is about 37173.6402710308. The cubic root of 1381879531 is about 1113.8414990982.

The spelling of 1381879531 in words is "one billion, three hundred eighty-one million, eight hundred seventy-nine thousand, five hundred thirty-one".