25913601 has 30 divisors (see below), whose sum is σ = 45037410. Its totient is φ = 14805504.

The previous prime is 25913597. The next prime is 25913603. The reversal of 25913601 is 10631952.

25913601 is a `hidden beast` number, since 2 + 59 + 1 + 3 + 601 = 666.

It can be written as a sum of positive squares in only one way, i.e., 16769025 + 9144576 = 4095^2 + 3024^2 .

It is not a de Polignac number, because 25913601 - 2² = 25913597 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25913603) by changing a digit.

It is a polite number, since it can be written in 29 ways as a sum of consecutive naturals, for example, 705 + ... + 7233.

It is an arithmetic number, because the mean of its divisors is an integer number (1501247).

Almost surely, 2^25913601 is an apocalyptic number.

25913601 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

25913601 is a deficient number, since it is larger than the sum of its proper divisors (19123809).

25913601 is an equidigital number, since it uses as much as digits as its factorization.

25913601 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6555 (or 6539 counting only the distinct ones).

The product of its (nonzero) digits is 1620, while the sum is 27.

The square root of 25913601 is about 5090.5403446000. The cubic root of 25913601 is about 295.9210930710.

The spelling of 25913601 in words is "twenty-five million, nine hundred thirteen thousand, six hundred one".