15120997 has 2 divisors, whose sum is σ = 15120998. Its totient is φ = 15120996.

The previous prime is 15120991. The next prime is 15121003. The reversal of 15120997 is 79902151.

It is a balanced prime because it is at equal distance from previous prime (15120991) and next prime (15121003).

It can be written as a sum of positive squares in only one way, i.e., 9235521 + 5885476 = 3039^2 + 2426^2 .

It is a cyclic number.

It is not a de Polignac number, because 15120997 - 2¹⁹ = 14596709 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (15120991) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7560498 + 7560499.

It is an arithmetic number, because the mean of its divisors is an integer number (7560499).

Almost surely, 2^15120997 is an apocalyptic number.

It is an amenable number.

15120997 is a deficient number, since it is larger than the sum of its proper divisors (1).

15120997 is an equidigital number, since it uses as much as digits as its factorization.

15120997 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5670, while the sum is 34.

The square root of 15120997 is about 3888.5726172980. The cubic root of 15120997 is about 247.2825529503.

The spelling of 15120997 in words is "fifteen million, one hundred twenty thousand, nine hundred ninety-seven".