15251681 has 2 divisors, whose sum is σ = 15251682. Its totient is φ = 15251680.

The previous prime is 15251617. The next prime is 15251689. The reversal of 15251681 is 18615251.

15251681 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15171025 + 80656 = 3895^2 + 284^2 .

It is an emirp because it is prime and its reverse (18615251) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 15251681 - 2⁶ = 15251617 is a prime.

It is a super-2 number, since 2×15251681² = 465227546651522, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (15251689) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7625840 + 7625841.

It is an arithmetic number, because the mean of its divisors is an integer number (7625841).

Almost surely, 2^15251681 is an apocalyptic number.

It is an amenable number.

15251681 is a deficient number, since it is larger than the sum of its proper divisors (1).

15251681 is an equidigital number, since it uses as much as digits as its factorization.

15251681 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2400, while the sum is 29.

The square root of 15251681 is about 3905.3400620176. The cubic root of 15251681 is about 247.9928945675.

The spelling of 15251681 in words is "fifteen million, two hundred fifty-one thousand, six hundred eighty-one".