15552391 has 2 divisors, whose sum is σ = 15552392. Its totient is φ = 15552390.

The previous prime is 15552379. The next prime is 15552403. The reversal of 15552391 is 19325551.

It is a balanced prime because it is at equal distance from previous prime (15552379) and next prime (15552403).

It is a cyclic number.

It is not a de Polignac number, because 15552391 - 2¹⁷ = 15421319 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (15552311) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7776195 + 7776196.

It is an arithmetic number, because the mean of its divisors is an integer number (7776196).

Almost surely, 2^15552391 is an apocalyptic number.

15552391 is a deficient number, since it is larger than the sum of its proper divisors (1).

15552391 is an equidigital number, since it uses as much as digits as its factorization.

15552391 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6750, while the sum is 31.

The square root of 15552391 is about 3943.6519876886. The cubic root of 15552391 is about 249.6121506025.

The spelling of 15552391 in words is "fifteen million, five hundred fifty-two thousand, three hundred ninety-one".