15628961 has 2 divisors, whose sum is σ = 15628962. Its totient is φ = 15628960.

The previous prime is 15628919. The next prime is 15628969. The reversal of 15628961 is 16982651.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15358561 + 270400 = 3919^2 + 520^2 .

It is a cyclic number.

It is not a de Polignac number, because 15628961 - 2⁶ = 15628897 is a prime.

It is not a weakly prime, because it can be changed into another prime (15628969) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7814480 + 7814481.

It is an arithmetic number, because the mean of its divisors is an integer number (7814481).

Almost surely, 2^15628961 is an apocalyptic number.

It is an amenable number.

15628961 is a deficient number, since it is larger than the sum of its proper divisors (1).

15628961 is an equidigital number, since it uses as much as digits as its factorization.

15628961 is an evil number, because the sum of its binary digits is even.

The product of its digits is 25920, while the sum is 38.

The square root of 15628961 is about 3953.3480747336. The cubic root of 15628961 is about 250.0211235485.

The spelling of 15628961 in words is "fifteen million, six hundred twenty-eight thousand, nine hundred sixty-one".