15495661 has 2 divisors, whose sum is σ = 15495662. Its totient is φ = 15495660.

The previous prime is 15495643. The next prime is 15495671. The reversal of 15495661 is 16659451.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14485636 + 1010025 = 3806^2 + 1005^2 .

It is a cyclic number.

It is not a de Polignac number, because 15495661 - 2¹³ = 15487469 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 15495661.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (15495611) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7747830 + 7747831.

It is an arithmetic number, because the mean of its divisors is an integer number (7747831).

Almost surely, 2^15495661 is an apocalyptic number.

It is an amenable number.

15495661 is a deficient number, since it is larger than the sum of its proper divisors (1).

15495661 is an equidigital number, since it uses as much as digits as its factorization.

15495661 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 32400, while the sum is 37.

The square root of 15495661 is about 3936.4528448846. The cubic root of 15495661 is about 249.3082798582.

The spelling of 15495661 in words is "fifteen million, four hundred ninety-five thousand, six hundred sixty-one".