15506969 has 2 divisors, whose sum is σ = 15506970. Its totient is φ = 15506968.

The previous prime is 15506963. The next prime is 15506977. The reversal of 15506969 is 96960551.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10272025 + 5234944 = 3205^2 + 2288^2 .

It is a cyclic number.

It is not a de Polignac number, because 15506969 - 2⁸ = 15506713 is a prime.

It is a super-2 number, since 2×15506969² = 480932175133922, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (15506963) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7753484 + 7753485.

It is an arithmetic number, because the mean of its divisors is an integer number (7753485).

Almost surely, 2^15506969 is an apocalyptic number.

It is an amenable number.

15506969 is a deficient number, since it is larger than the sum of its proper divisors (1).

15506969 is an equidigital number, since it uses as much as digits as its factorization.

15506969 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 72900, while the sum is 41.

The square root of 15506969 is about 3937.8889014293. Note that the first 3 decimals coincide. The cubic root of 15506969 is about 249.3689095733.

The spelling of 15506969 in words is "fifteen million, five hundred six thousand, nine hundred sixty-nine".