15120551 has 2 divisors, whose sum is σ = 15120552. Its totient is φ = 15120550.

The previous prime is 15120541. The next prime is 15120587. The reversal of 15120551 is 15502151.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 15120551 - 2⁶ = 15120487 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (15120541) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7560275 + 7560276.

It is an arithmetic number, because the mean of its divisors is an integer number (7560276).

Almost surely, 2^15120551 is an apocalyptic number.

15120551 is a deficient number, since it is larger than the sum of its proper divisors (1).

15120551 is an equidigital number, since it uses as much as digits as its factorization.

15120551 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 250, while the sum is 20.

The square root of 15120551 is about 3888.5152693541. The cubic root of 15120551 is about 247.2801216930.

It can be divided in two parts, 151 and 20551, that added together give a palindrome (20702).

The spelling of 15120551 in words is "fifteen million, one hundred twenty thousand, five hundred fifty-one".