15649201 has 2 divisors, whose sum is σ = 15649202. Its totient is φ = 15649200.

The previous prime is 15649199. The next prime is 15649211. The reversal of 15649201 is 10294651.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11022400 + 4626801 = 3320^2 + 2151^2 .

It is an emirp because it is prime and its reverse (10294651) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 15649201 - 2¹ = 15649199 is a prime.

Together with 15649199, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 15649201.

It is not a weakly prime, because it can be changed into another prime (15649211) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7824600 + 7824601.

It is an arithmetic number, because the mean of its divisors is an integer number (7824601).

Almost surely, 2^15649201 is an apocalyptic number.

It is an amenable number.

15649201 is a deficient number, since it is larger than the sum of its proper divisors (1).

15649201 is an equidigital number, since it uses as much as digits as its factorization.

15649201 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2160, while the sum is 28.

The square root of 15649201 is about 3955.9071020437. The cubic root of 15649201 is about 250.1290054190.

The spelling of 15649201 in words is "fifteen million, six hundred forty-nine thousand, two hundred one".