15615461 has 2 divisors, whose sum is σ = 15615462. Its totient is φ = 15615460.

The previous prime is 15615433. The next prime is 15615487. The reversal of 15615461 is 16451651.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14394436 + 1221025 = 3794^2 + 1105^2 .

It is an emirp because it is prime and its reverse (16451651) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 15615461 - 2¹⁰ = 15614437 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (15615491) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7807730 + 7807731.

It is an arithmetic number, because the mean of its divisors is an integer number (7807731).

Almost surely, 2^15615461 is an apocalyptic number.

It is an amenable number.

15615461 is a deficient number, since it is larger than the sum of its proper divisors (1).

15615461 is an equidigital number, since it uses as much as digits as its factorization.

15615461 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3600, while the sum is 29.

The square root of 15615461 is about 3951.6402923343. The cubic root of 15615461 is about 249.9491149769.

The spelling of 15615461 in words is "fifteen million, six hundred fifteen thousand, four hundred sixty-one".