25731613 has 8 divisors (see below), whose sum is σ = 27339480. Its totient is φ = 24171840.

The previous prime is 25731571. The next prime is 25731631. The reversal of 25731613 is 31613752.

It can be written as a sum of positive squares in 4 ways, for example, as 1505529 + 24226084 = 1227^2 + 4922^2 .

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 25731613 - 2¹³ = 25723421 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25731653) 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, 10918 + ... + 13063.

It is an arithmetic number, because the mean of its divisors is an integer number (3417435).

Almost surely, 2^25731613 is an apocalyptic number.

It is an amenable number.

25731613 is a deficient number, since it is larger than the sum of its proper divisors (1607867).

25731613 is a wasteful number, since it uses less digits than its factorization.

25731613 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24047.

The product of its digits is 3780, while the sum is 28.

The square root of 25731613 is about 5072.6337340675. The cubic root of 25731613 is about 295.2267260182.

It can be divided in two parts, 2573 and 1613, that added together give a triangular number (4186 = T₉₁).

The spelling of 25731613 in words is "twenty-five million, seven hundred thirty-one thousand, six hundred thirteen".