25931561 has 8 divisors (see below), whose sum is σ = 28034880. Its totient is φ = 23902128.

The previous prime is 25931519. The next prime is 25931567. The reversal of 25931561 is 16513952.

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

It is a cyclic number.

It is not a de Polignac number, because 25931561 - 2¹⁴ = 25915177 is a prime.

It is not an unprimeable number, because it can be changed into a prime (25931567) 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, 17741 + ... + 19146.

It is an arithmetic number, because the mean of its divisors is an integer number (3504360).

Almost surely, 2^25931561 is an apocalyptic number.

It is an amenable number.

25931561 is a deficient number, since it is larger than the sum of its proper divisors (2103319).

25931561 is a wasteful number, since it uses less digits than its factorization.

25931561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36943.

The product of its digits is 8100, while the sum is 32.

The square root of 25931561 is about 5092.3040953973. The cubic root of 25931561 is about 295.9894421910.

The spelling of 25931561 in words is "twenty-five million, nine hundred thirty-one thousand, five hundred sixty-one".