25561061 has 8 divisors (see below), whose sum is σ = 26990880. Its totient is φ = 24139728.

The previous prime is 25561057. The next prime is 25561079. The reversal of 25561061 is 16016552.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 25561061 - 2² = 25561057 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 25561061.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25561031) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4655 + ... + 8531.

It is an arithmetic number, because the mean of its divisors is an integer number (3373860).

Almost surely, 2^25561061 is an apocalyptic number.

It is an amenable number.

25561061 is a deficient number, since it is larger than the sum of its proper divisors (1429819).

25561061 is a wasteful number, since it uses less digits than its factorization.

25561061 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4243.

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

The square root of 25561061 is about 5055.7947940952. The cubic root of 25561061 is about 294.5730143734.

It can be divided in two parts, 255 and 61061, that added together give a palindrome (61316).

The spelling of 25561061 in words is "twenty-five million, five hundred sixty-one thousand, sixty-one".