15251235281 has 2 divisors, whose sum is σ = 15251235282. Its totient is φ = 15251235280.

The previous prime is 15251235221. The next prime is 15251235283. The reversal of 15251235281 is 18253215251.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7793358400 + 7457876881 = 88280^2 + 86359^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-15251235281 is a prime.

It is a super-2 number, since 2×15251235281² (a number of 21 digits) contains 22 as substring.

It is a Sophie Germain prime.

Together with 15251235283, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (15251235283) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7625617640 + 7625617641.

It is an arithmetic number, because the mean of its divisors is an integer number (7625617641).

Almost surely, 2^15251235281 is an apocalyptic number.

It is an amenable number.

15251235281 is a deficient number, since it is larger than the sum of its proper divisors (1).

15251235281 is an equidigital number, since it uses as much as digits as its factorization.

15251235281 is an evil number, because the sum of its binary digits is even.

The product of its digits is 24000, while the sum is 35.

The spelling of 15251235281 in words is "fifteen billion, two hundred fifty-one million, two hundred thirty-five thousand, two hundred eighty-one".