1271972431 has 2 divisors, whose sum is σ = 1271972432. Its totient is φ = 1271972430.

The previous prime is 1271972417. The next prime is 1271972477. The reversal of 1271972431 is 1342791721.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1271972431 - 2¹⁷ = 1271841359 is a prime.

It is a super-2 number, since 2×1271972431² = 3235827730448099522, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1271972231) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 635986215 + 635986216.

It is an arithmetic number, because the mean of its divisors is an integer number (635986216).

Almost surely, 2^1271972431 is an apocalyptic number.

1271972431 is a deficient number, since it is larger than the sum of its proper divisors (1).

1271972431 is an equidigital number, since it uses as much as digits as its factorization.

1271972431 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 21168, while the sum is 37.

The square root of 1271972431 is about 35664.7224999719. The cubic root of 1271972431 is about 1083.4924751035.

The spelling of 1271972431 in words is "one billion, two hundred seventy-one million, nine hundred seventy-two thousand, four hundred thirty-one".