1319781431 has 4 divisors (see below), whose sum is σ = 1351971264. Its totient is φ = 1287591600.

The previous prime is 1319781391. The next prime is 1319781433. The reversal of 1319781431 is 1341879131.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1319781431 - 2²² = 1315587127 is a prime.

It is a super-2 number, since 2×1319781431² = 3483646051224815522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1319781433) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16094855 + ... + 16094936.

It is an arithmetic number, because the mean of its divisors is an integer number (337992816).

Almost surely, 2^1319781431 is an apocalyptic number.

1319781431 is a deficient number, since it is larger than the sum of its proper divisors (32189833).

1319781431 is an equidigital number, since it uses as much as digits as its factorization.

1319781431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32189832.

The product of its digits is 18144, while the sum is 38.

The square root of 1319781431 is about 36328.7961677785. The cubic root of 1319781431 is about 1096.9007612513.

The spelling of 1319781431 in words is "one billion, three hundred nineteen million, seven hundred eighty-one thousand, four hundred thirty-one".