1253315813 has 2 divisors, whose sum is σ = 1253315814. Its totient is φ = 1253315812.

The previous prime is 1253315809. The next prime is 1253315827. The reversal of 1253315813 is 3185133521.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 659565124 + 593750689 = 25682^2 + 24367^2 .

It is a cyclic number.

It is not a de Polignac number, because 1253315813 - 2² = 1253315809 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1253315813.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1253315873) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 626657906 + 626657907.

It is an arithmetic number, because the mean of its divisors is an integer number (626657907).

Almost surely, 2^1253315813 is an apocalyptic number.

It is an amenable number.

1253315813 is a deficient number, since it is larger than the sum of its proper divisors (1).

1253315813 is an equidigital number, since it uses as much as digits as its factorization.

1253315813 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10800, while the sum is 32.

The square root of 1253315813 is about 35402.2006801837. The cubic root of 1253315813 is about 1078.1689977177.

The spelling of 1253315813 in words is "one billion, two hundred fifty-three million, three hundred fifteen thousand, eight hundred thirteen".