25391213 has 8 divisors (see below), whose sum is σ = 26312568. Its totient is φ = 24482304.

The previous prime is 25391209. The next prime is 25391221. The reversal of 25391213 is 31219352.

It can be written as a sum of positive squares in 4 ways, for example, as 6538249 + 18852964 = 2557^2 + 4342^2 .

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 25391213 - 2² = 25391209 is a prime.

It is a super-2 number, since 2×25391213² = 1289427395222738, 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 (25391243) 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, 1145 + ... + 7217.

It is an arithmetic number, because the mean of its divisors is an integer number (3289071).

Almost surely, 2^25391213 is an apocalyptic number.

It is an amenable number.

25391213 is a deficient number, since it is larger than the sum of its proper divisors (921355).

25391213 is a wasteful number, since it uses less digits than its factorization.

25391213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6223.

The product of its digits is 1620, while the sum is 26.

The square root of 25391213 is about 5038.9694382880. The cubic root of 25391213 is about 293.9191048047.

The spelling of 25391213 in words is "twenty-five million, three hundred ninety-one thousand, two hundred thirteen".