25158961 has 2 divisors, whose sum is σ = 25158962. Its totient is φ = 25158960.

The previous prime is 25158919. The next prime is 25158971. The reversal of 25158961 is 16985152.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 22268961 + 2890000 = 4719^2 + 1700^2 .

It is a cyclic number.

It is not a de Polignac number, because 25158961 - 2⁹ = 25158449 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 25158961.

It is not a weakly prime, because it can be changed into another prime (25158911) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12579480 + 12579481.

It is an arithmetic number, because the mean of its divisors is an integer number (12579481).

Almost surely, 2^25158961 is an apocalyptic number.

It is an amenable number.

25158961 is a deficient number, since it is larger than the sum of its proper divisors (1).

25158961 is an equidigital number, since it uses as much as digits as its factorization.

25158961 is an evil number, because the sum of its binary digits is even.

The product of its digits is 21600, while the sum is 37.

The square root of 25158961 is about 5015.8709114171. The cubic root of 25158961 is about 293.0202046274.

It can be divided in two parts, 2515 and 8961, that added together give a triangular number (11476 = T₁₅₁).

The spelling of 25158961 in words is "twenty-five million, one hundred fifty-eight thousand, nine hundred sixty-one".