25615601 has 4 divisors (see below), whose sum is σ = 27944304. Its totient is φ = 23286900.

The previous prime is 25615571. The next prime is 25615619. The reversal of 25615601 is 10651652.

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.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25615601 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (25615621) 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, 1164335 + ... + 1164356.

It is an arithmetic number, because the mean of its divisors is an integer number (6986076).

Almost surely, 2^25615601 is an apocalyptic number.

It is an amenable number.

25615601 is a deficient number, since it is larger than the sum of its proper divisors (2328703).

25615601 is a wasteful number, since it uses less digits than its factorization.

25615601 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2328702.

The product of its (nonzero) digits is 1800, while the sum is 26.

The square root of 25615601 is about 5061.1857306366. The cubic root of 25615601 is about 294.7823770830.

The spelling of 25615601 in words is "twenty-five million, six hundred fifteen thousand, six hundred one".