15525551 has 2 divisors, whose sum is σ = 15525552. Its totient is φ = 15525550.

The previous prime is 15525541. The next prime is 15525553. The reversal of 15525551 is 15552551.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 15525551 - 2⁶ = 15525487 is a prime.

Together with 15525553, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (15525553) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7762775 + 7762776.

It is an arithmetic number, because the mean of its divisors is an integer number (7762776).

Almost surely, 2^15525551 is an apocalyptic number.

15525551 is a deficient number, since it is larger than the sum of its proper divisors (1).

15525551 is an equidigital number, since it uses as much as digits as its factorization.

15525551 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6250, while the sum is 29.

The square root of 15525551 is about 3940.2475810538. The cubic root of 15525551 is about 249.4684760634.

Subtracting 15525551 from its reverse (15552551), we obtain a cube (27000 = 30³).

The spelling of 15525551 in words is "fifteen million, five hundred twenty-five thousand, five hundred fifty-one".