1251046513 has 2 divisors, whose sum is σ = 1251046514. Its totient is φ = 1251046512.

The previous prime is 1251046481. The next prime is 1251046529. The reversal of 1251046513 is 3156401521.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 922458384 + 328588129 = 30372^2 + 18127^2 .

It is a cyclic number.

It is not a de Polignac number, because 1251046513 - 2⁵ = 1251046481 is a prime.

It is not a weakly prime, because it can be changed into another prime (1251046543) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 625523256 + 625523257.

It is an arithmetic number, because the mean of its divisors is an integer number (625523257).

Almost surely, 2^1251046513 is an apocalyptic number.

It is an amenable number.

1251046513 is a deficient number, since it is larger than the sum of its proper divisors (1).

1251046513 is an equidigital number, since it uses as much as digits as its factorization.

1251046513 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3600, while the sum is 28.

The square root of 1251046513 is about 35370.1358917378. The cubic root of 1251046513 is about 1077.5178803492.

The spelling of 1251046513 in words is "one billion, two hundred fifty-one million, forty-six thousand, five hundred thirteen".