15609901 has 2 divisors, whose sum is σ = 15609902. Its totient is φ = 15609900.

The previous prime is 15609899. The next prime is 15609911. The reversal of 15609901 is 10990651.

15609901 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13329801 + 2280100 = 3651^2 + 1510^2 .

It is a cyclic number.

It is not a de Polignac number, because 15609901 - 2¹ = 15609899 is a prime.

Together with 15609899, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (15609911) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7804950 + 7804951.

It is an arithmetic number, because the mean of its divisors is an integer number (7804951).

Almost surely, 2^15609901 is an apocalyptic number.

It is an amenable number.

15609901 is a deficient number, since it is larger than the sum of its proper divisors (1).

15609901 is an equidigital number, since it uses as much as digits as its factorization.

15609901 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2430, while the sum is 31.

The square root of 15609901 is about 3950.9367243731. The cubic root of 15609901 is about 249.9194460470.

The spelling of 15609901 in words is "fifteen million, six hundred nine thousand, nine hundred one".