25249381 has 4 divisors (see below), whose sum is σ = 25340812. Its totient is φ = 25157952.

The previous prime is 25249373. The next prime is 25249409. The reversal of 25249381 is 18394252.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2353156 + 22896225 = 1534^2 + 4785^2 .

It is a cyclic number.

It is not a de Polignac number, because 25249381 - 2³ = 25249373 is a prime.

It is a super-2 number, since 2×25249381² = 1275062481766322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25249351) 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, 45300 + ... + 45853.

It is an arithmetic number, because the mean of its divisors is an integer number (6335203).

Almost surely, 2^25249381 is an apocalyptic number.

It is an amenable number.

25249381 is a deficient number, since it is larger than the sum of its proper divisors (91431).

25249381 is an equidigital number, since it uses as much as digits as its factorization.

25249381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 91430.

The product of its digits is 17280, while the sum is 34.

The square root of 25249381 is about 5024.8762173809. The cubic root of 25249381 is about 293.3708180689.

The spelling of 25249381 in words is "twenty-five million, two hundred forty-nine thousand, three hundred eighty-one".