15556601 has 4 divisors (see below), whose sum is σ = 15753600. Its totient is φ = 15359604.

The previous prime is 15556571. The next prime is 15556609. The reversal of 15556601 is 10665551.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 10665551 = 13 ⋅820427.

It is a cyclic number.

It is not a de Polignac number, because 15556601 - 2¹⁸ = 15294457 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (15556609) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 98381 + ... + 98538.

It is an arithmetic number, because the mean of its divisors is an integer number (3938400).

Almost surely, 2^15556601 is an apocalyptic number.

It is an amenable number.

15556601 is a deficient number, since it is larger than the sum of its proper divisors (196999).

15556601 is an equidigital number, since it uses as much as digits as its factorization.

15556601 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 196998.

The product of its (nonzero) digits is 4500, while the sum is 29.

The square root of 15556601 is about 3944.1857207794. The cubic root of 15556601 is about 249.6346717344.

The spelling of 15556601 in words is "fifteen million, five hundred fifty-six thousand, six hundred one".