15649951 has 2 divisors, whose sum is σ = 15649952. Its totient is φ = 15649950.

The previous prime is 15649897. The next prime is 15649993. The reversal of 15649951 is 15994651.

It is a strong prime.

It is an emirp because it is prime and its reverse (15994651) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-15649951 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (15649351) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7824975 + 7824976.

It is an arithmetic number, because the mean of its divisors is an integer number (7824976).

Almost surely, 2^15649951 is an apocalyptic number.

15649951 is a deficient number, since it is larger than the sum of its proper divisors (1).

15649951 is an equidigital number, since it uses as much as digits as its factorization.

15649951 is an evil number, because the sum of its binary digits is even.

The product of its digits is 48600, while the sum is 40.

The square root of 15649951 is about 3956.0018958539. The cubic root of 15649951 is about 250.1330012301.

The spelling of 15649951 in words is "fifteen million, six hundred forty-nine thousand, nine hundred fifty-one".