15655261 has 2 divisors, whose sum is σ = 15655262. Its totient is φ = 15655260.

The previous prime is 15655253. The next prime is 15655267. The reversal of 15655261 is 16255651.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15452761 + 202500 = 3931^2 + 450^2 .

It is a cyclic number.

It is not a de Polignac number, because 15655261 - 2³ = 15655253 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (15655267) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7827630 + 7827631.

It is an arithmetic number, because the mean of its divisors is an integer number (7827631).

Almost surely, 2^15655261 is an apocalyptic number.

It is an amenable number.

15655261 is a deficient number, since it is larger than the sum of its proper divisors (1).

15655261 is an equidigital number, since it uses as much as digits as its factorization.

15655261 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 9000, while the sum is 31.

The square root of 15655261 is about 3956.6729710705. The cubic root of 15655261 is about 250.1612879224.

The spelling of 15655261 in words is "fifteen million, six hundred fifty-five thousand, two hundred sixty-one".