1265401279 has 2 divisors, whose sum is σ = 1265401280. Its totient is φ = 1265401278.

The previous prime is 1265401237. The next prime is 1265401321. The reversal of 1265401279 is 9721045621.

It is a balanced prime because it is at equal distance from previous prime (1265401237) and next prime (1265401321).

It is a cyclic number.

It is not a de Polignac number, because 1265401279 - 2²³ = 1257012671 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1265401229) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 632700639 + 632700640.

It is an arithmetic number, because the mean of its divisors is an integer number (632700640).

Almost surely, 2^1265401279 is an apocalyptic number.

1265401279 is a deficient number, since it is larger than the sum of its proper divisors (1).

1265401279 is an equidigital number, since it uses as much as digits as its factorization.

1265401279 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 30240, while the sum is 37.

The square root of 1265401279 is about 35572.4792360611. The cubic root of 1265401279 is about 1081.6234383666.

The spelling of 1265401279 in words is "one billion, two hundred sixty-five million, four hundred one thousand, two hundred seventy-nine".