25361861 has 6 divisors (see below), whose sum is σ = 29502630. Its totient is φ = 21738696.

The previous prime is 25361837. The next prime is 25361887. The reversal of 25361861 is 16816352.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 18653761 + 6708100 = 4319^2 + 2590^2 .

It is not a de Polignac number, because 25361861 - 2²² = 21167557 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25361261) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 258746 + ... + 258843.

It is an arithmetic number, because the mean of its divisors is an integer number (4917105).

Almost surely, 2^25361861 is an apocalyptic number.

It is an amenable number.

25361861 is a deficient number, since it is larger than the sum of its proper divisors (4140769).

25361861 is an equidigital number, since it uses as much as digits as its factorization.

25361861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 517603 (or 517596 counting only the distinct ones).

The product of its digits is 8640, while the sum is 32.

The square root of 25361861 is about 5036.0560957956. The cubic root of 25361861 is about 293.8058052420.

The spelling of 25361861 in words is "twenty-five million, three hundred sixty-one thousand, eight hundred sixty-one".