1279968731 has 2 divisors, whose sum is σ = 1279968732. Its totient is φ = 1279968730.

The previous prime is 1279968689. The next prime is 1279968749. The reversal of 1279968731 is 1378699721.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1279968731 - 2⁶ = 1279968667 is a prime.

It is a super-2 number, since 2×1279968731² = 3276639904675500722, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1279968931) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 639984365 + 639984366.

It is an arithmetic number, because the mean of its divisors is an integer number (639984366).

Almost surely, 2^1279968731 is an apocalyptic number.

1279968731 is a deficient number, since it is larger than the sum of its proper divisors (1).

1279968731 is an equidigital number, since it uses as much as digits as its factorization.

1279968731 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1143072, while the sum is 53.

The square root of 1279968731 is about 35776.6506397678. The cubic root of 1279968731 is about 1085.7582051988.

The spelling of 1279968731 in words is "one billion, two hundred seventy-nine million, nine hundred sixty-eight thousand, seven hundred thirty-one".