15612973249 has 2 divisors, whose sum is σ = 15612973250. Its totient is φ = 15612973248.

The previous prime is 15612973177. The next prime is 15612973261. The reversal of 15612973249 is 94237921651.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13029081025 + 2583892224 = 114145^2 + 50832^2 .

It is an emirp because it is prime and its reverse (94237921651) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 15612973249 - 2⁷ = 15612973121 is a prime.

It is not a weakly prime, because it can be changed into another prime (15612971249) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7806486624 + 7806486625.

It is an arithmetic number, because the mean of its divisors is an integer number (7806486625).

Almost surely, 2^15612973249 is an apocalyptic number.

It is an amenable number.

15612973249 is a deficient number, since it is larger than the sum of its proper divisors (1).

15612973249 is an equidigital number, since it uses as much as digits as its factorization.

15612973249 is an evil number, because the sum of its binary digits is even.

The product of its digits is 816480, while the sum is 49.

The spelling of 15612973249 in words is "fifteen billion, six hundred twelve million, nine hundred seventy-three thousand, two hundred forty-nine".