15249971281 has 2 divisors, whose sum is σ = 15249971282. Its totient is φ = 15249971280.

The previous prime is 15249971257. The next prime is 15249971287. The reversal of 15249971281 is 18217994251.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15149671056 + 100300225 = 123084^2 + 10015^2 .

It is a cyclic number.

It is not a de Polignac number, because 15249971281 - 2¹¹ = 15249969233 is a prime.

It is a super-2 number, since 2×15249971281² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (15249971287) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7624985640 + 7624985641.

It is an arithmetic number, because the mean of its divisors is an integer number (7624985641).

Almost surely, 2^15249971281 is an apocalyptic number.

It is an amenable number.

15249971281 is a deficient number, since it is larger than the sum of its proper divisors (1).

15249971281 is an equidigital number, since it uses as much as digits as its factorization.

15249971281 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 362880, while the sum is 49.

The spelling of 15249971281 in words is "fifteen billion, two hundred forty-nine million, nine hundred seventy-one thousand, two hundred eighty-one".