1381078431 has 20 divisors (see below), whose sum is σ = 2098067400. Its totient is φ = 905110416.

The previous prime is 1381078423. The next prime is 1381078463. The reversal of 1381078431 is 1348701831.

It is not a de Polignac number, because 1381078431 - 2³ = 1381078423 is a prime.

It is a super-2 number, since 2×1381078431² = 3814755265146843522, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1381078421) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 139716 + ... + 149273.

It is an arithmetic number, because the mean of its divisors is an integer number (104903370).

Almost surely, 2^1381078431 is an apocalyptic number.

1381078431 is a deficient number, since it is larger than the sum of its proper divisors (716988969).

1381078431 is an equidigital number, since it uses as much as digits as its factorization.

1381078431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 289060 (or 289051 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 36.

The square root of 1381078431 is about 37162.8636006430. The cubic root of 1381078431 is about 1113.6262196213.

The spelling of 1381078431 in words is "one billion, three hundred eighty-one million, seventy-eight thousand, four hundred thirty-one".