1269831431 has 4 divisors (see below), whose sum is σ = 1385270664. Its totient is φ = 1154392200.

The previous prime is 1269831419. The next prime is 1269831457. The reversal of 1269831431 is 1341389621.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1269831431 is a prime.

It is a super-2 number, since 2×1269831431² = 3224943726311015522, 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 (1269831931) 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, 57719600 + ... + 57719621.

It is an arithmetic number, because the mean of its divisors is an integer number (346317666).

Almost surely, 2^1269831431 is an apocalyptic number.

1269831431 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1269831431 is a deficient number, since it is larger than the sum of its proper divisors (115439233).

1269831431 is a wasteful number, since it uses less digits than its factorization.

1269831431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 115439232.

The product of its digits is 31104, while the sum is 38.

The square root of 1269831431 is about 35634.6942038233. The cubic root of 1269831431 is about 1082.8842176446.

The spelling of 1269831431 in words is "one billion, two hundred sixty-nine million, eight hundred thirty-one thousand, four hundred thirty-one".