1251685013 has 2 divisors, whose sum is σ = 1251685014. Its totient is φ = 1251685012.

The previous prime is 1251685003. The next prime is 1251685031. The reversal of 1251685013 is 3105861521.

Together with next prime (1251685031) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1153417444 + 98267569 = 33962^2 + 9913^2 .

It is a cyclic number.

It is not a de Polignac number, because 1251685013 - 2⁴ = 1251684997 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1251685003) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 625842506 + 625842507.

It is an arithmetic number, because the mean of its divisors is an integer number (625842507).

Almost surely, 2^1251685013 is an apocalyptic number.

It is an amenable number.

1251685013 is a deficient number, since it is larger than the sum of its proper divisors (1).

1251685013 is an equidigital number, since it uses as much as digits as its factorization.

1251685013 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7200, while the sum is 32.

The square root of 1251685013 is about 35379.1607164444. The cubic root of 1251685013 is about 1077.7011610794.

The spelling of 1251685013 in words is "one billion, two hundred fifty-one million, six hundred eighty-five thousand, thirteen".