1252698779 has 2 divisors, whose sum is σ = 1252698780. Its totient is φ = 1252698778.

The previous prime is 1252698739. The next prime is 1252698781. The reversal of 1252698779 is 9778962521.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1252698779 - 2²⁴ = 1235921563 is a prime.

Together with 1252698781, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1252698739) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 626349389 + 626349390.

It is an arithmetic number, because the mean of its divisors is an integer number (626349390).

Almost surely, 2^1252698779 is an apocalyptic number.

1252698779 is a deficient number, since it is larger than the sum of its proper divisors (1).

1252698779 is an equidigital number, since it uses as much as digits as its factorization.

1252698779 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3810240, while the sum is 56.

The square root of 1252698779 is about 35393.4849795835. The cubic root of 1252698779 is about 1077.9920335061.

The spelling of 1252698779 in words is "one billion, two hundred fifty-two million, six hundred ninety-eight thousand, seven hundred seventy-nine".