25454561 has 4 divisors (see below), whose sum is σ = 27768624. Its totient is φ = 23140500.

The previous prime is 25454543. The next prime is 25454579. The reversal of 25454561 is 16545452.

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 an interprime number because it is at equal distance from previous prime (25454543) and next prime (25454579).

It is a cyclic number.

It is not a de Polignac number, because 25454561 - 2¹⁸ = 25192417 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25454501) 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, 1157015 + ... + 1157036.

It is an arithmetic number, because the mean of its divisors is an integer number (6942156).

Almost surely, 2^25454561 is an apocalyptic number.

It is an amenable number.

25454561 is a deficient number, since it is larger than the sum of its proper divisors (2314063).

25454561 is a wasteful number, since it uses less digits than its factorization.

25454561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2314062.

The product of its digits is 24000, while the sum is 32.

The square root of 25454561 is about 5045.2513316980. The cubic root of 25454561 is about 294.1633326625.

The spelling of 25454561 in words is "twenty-five million, four hundred fifty-four thousand, five hundred sixty-one".