25421291 has 8 divisors (see below), whose sum is σ = 29601504. Its totient is φ = 21378240.

The previous prime is 25421287. The next prime is 25421321. The reversal of 25421291 is 19212452.

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 25421291 - 2² = 25421287 is a prime.

It is a super-2 number, since 2×25421291² = 1292484072213362, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 25421291.

It is not an unprimeable number, because it can be changed into a prime (25421251) 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, 33890 + ... + 34631.

It is an arithmetic number, because the mean of its divisors is an integer number (3700188).

Almost surely, 2^25421291 is an apocalyptic number.

25421291 is a deficient number, since it is larger than the sum of its proper divisors (4180213).

25421291 is an equidigital number, since it uses as much as digits as its factorization.

25421291 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68581.

The product of its digits is 1440, while the sum is 26.

The square root of 25421291 is about 5041.9530937921. The cubic root of 25421291 is about 294.0351162028.

The spelling of 25421291 in words is "twenty-five million, four hundred twenty-one thousand, two hundred ninety-one".