1349931381 has 16 divisors (see below), whose sum is σ = 1825551360. Its totient is φ = 887168880.

The previous prime is 1349931377. The next prime is 1349931391. The reversal of 1349931381 is 1831399431.

It is not a de Polignac number, because 1349931381 - 2² = 1349931377 is a prime.

It is a super-2 number, since 2×1349931381² = 3644629466817134322, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1349931391) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 159646 + ... + 167888.

It is an arithmetic number, because the mean of its divisors is an integer number (114096960).

Almost surely, 2^1349931381 is an apocalyptic number.

It is an amenable number.

1349931381 is a deficient number, since it is larger than the sum of its proper divisors (475619979).

1349931381 is an equidigital number, since it uses as much as digits as its factorization.

1349931381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9016.

The product of its digits is 69984, while the sum is 42.

The square root of 1349931381 is about 36741.4123435668. The cubic root of 1349931381 is about 1105.1907237521.

The spelling of 1349931381 in words is "one billion, three hundred forty-nine million, nine hundred thirty-one thousand, three hundred eighty-one".