1251533113 has 2 divisors, whose sum is σ = 1251533114. Its totient is φ = 1251533112.

The previous prime is 1251533093. The next prime is 1251533119. The reversal of 1251533113 is 3113351521.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1149684649 + 101848464 = 33907^2 + 10092^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1251533113 is a prime.

It is not a weakly prime, because it can be changed into another prime (1251533119) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 625766556 + 625766557.

It is an arithmetic number, because the mean of its divisors is an integer number (625766557).

Almost surely, 2^1251533113 is an apocalyptic number.

It is an amenable number.

1251533113 is a deficient number, since it is larger than the sum of its proper divisors (1).

1251533113 is an equidigital number, since it uses as much as digits as its factorization.

1251533113 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1350, while the sum is 25.

The square root of 1251533113 is about 35377.0139073382. The cubic root of 1251533113 is about 1077.6575640010.

Adding to 1251533113 its reverse (3113351521), we get a palindrome (4364884634).

The spelling of 1251533113 in words is "one billion, two hundred fifty-one million, five hundred thirty-three thousand, one hundred thirteen".