1253899979 has 2 divisors, whose sum is σ = 1253899980. Its totient is φ = 1253899978.

The previous prime is 1253899949. The next prime is 1253899987. The reversal of 1253899979 is 9799983521.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1253899979 - 2²⁰ = 1252851403 is a prime.

It is not a weakly prime, because it can be changed into another prime (1253899939) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 626949989 + 626949990.

It is an arithmetic number, because the mean of its divisors is an integer number (626949990).

Almost surely, 2^1253899979 is an apocalyptic number.

1253899979 is a deficient number, since it is larger than the sum of its proper divisors (1).

1253899979 is an equidigital number, since it uses as much as digits as its factorization.

1253899979 is an evil number, because the sum of its binary digits is even.

The product of its digits is 11022480, while the sum is 62.

The square root of 1253899979 is about 35410.4501383419. The cubic root of 1253899979 is about 1078.3364819319.

The spelling of 1253899979 in words is "one billion, two hundred fifty-three million, eight hundred ninety-nine thousand, nine hundred seventy-nine".