251225213 has 8 divisors (see below), whose sum is σ = 253007040. Its totient is φ = 249449760.

The previous prime is 251225197. The next prime is 251225243. The reversal of 251225213 is 312522152.

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 251225213 - 2⁴ = 251225197 is a prime.

It is a super-2 number, since 2×251225213² = 126228215293790738, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (251225243) 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, 98393 + ... + 100913.

It is an arithmetic number, because the mean of its divisors is an integer number (31625880).

Almost surely, 2^251225213 is an apocalyptic number.

It is an amenable number.

251225213 is a deficient number, since it is larger than the sum of its proper divisors (1781827).

251225213 is a wasteful number, since it uses less digits than its factorization.

251225213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3187.

The product of its digits is 1200, while the sum is 23.

The square root of 251225213 is about 15850.0855833652. The cubic root of 251225213 is about 630.9879627636.

Adding to 251225213 its reverse (312522152), we get a palindrome (563747365).

The spelling of 251225213 in words is "two hundred fifty-one million, two hundred twenty-five thousand, two hundred thirteen".