15120661 has 2 divisors, whose sum is σ = 15120662. Its totient is φ = 15120660.

The previous prime is 15120613. The next prime is 15120673. The reversal of 15120661 is 16602151.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11771761 + 3348900 = 3431^2 + 1830^2 .

It is an emirp because it is prime and its reverse (16602151) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 15120661 - 2²¹ = 13023509 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (15120601) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7560330 + 7560331.

It is an arithmetic number, because the mean of its divisors is an integer number (7560331).

Almost surely, 2^15120661 is an apocalyptic number.

It is an amenable number.

15120661 is a deficient number, since it is larger than the sum of its proper divisors (1).

15120661 is an equidigital number, since it uses as much as digits as its factorization.

15120661 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 360, while the sum is 22.

The square root of 15120661 is about 3888.5294135444. The cubic root of 15120661 is about 247.2807213349.

The spelling of 15120661 in words is "fifteen million, one hundred twenty thousand, six hundred sixty-one".