25129381 has 4 divisors (see below), whose sum is σ = 26452000. Its totient is φ = 23806764.

The previous prime is 25129373. The next prime is 25129397. The reversal of 25129381 is 18392152.

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 a cyclic number.

It is not a de Polignac number, because 25129381 - 2³ = 25129373 is a prime.

It is a super-2 number, since 2×25129381² = 1262971578886322, 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 (25129361) 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, 661281 + ... + 661318.

It is an arithmetic number, because the mean of its divisors is an integer number (6613000).

Almost surely, 2^25129381 is an apocalyptic number.

It is an amenable number.

25129381 is a deficient number, since it is larger than the sum of its proper divisors (1322619).

25129381 is a wasteful number, since it uses less digits than its factorization.

25129381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1322618.

The product of its digits is 4320, while the sum is 31.

The square root of 25129381 is about 5012.9214037326. The cubic root of 25129381 is about 292.9053226078.

The spelling of 25129381 in words is "twenty-five million, one hundred twenty-nine thousand, three hundred eighty-one".