213875251 has 4 divisors (see below), whose sum is σ = 213905104. Its totient is φ = 213845400.

The previous prime is 213875161. The next prime is 213875257. The reversal of 213875251 is 152578312.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a 3-Lehmer number, since φ(213875251) divides (213875251-1)³.

It is a cyclic number.

It is not a de Polignac number, because 213875251 - 2¹¹ = 213873203 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (213875257) 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, 2986 + ... + 20896.

It is an arithmetic number, because the mean of its divisors is an integer number (53476276).

Almost surely, 2^213875251 is an apocalyptic number.

213875251 is the 11941-st pentagonal number.

213875251 is a deficient number, since it is larger than the sum of its proper divisors (29853).

213875251 is a wasteful number, since it uses less digits than its factorization.

213875251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29852.

The product of its digits is 16800, while the sum is 34.

The square root of 213875251 is about 14624.4743837172. The cubic root of 213875251 is about 598.0261534853.

The spelling of 213875251 in words is "two hundred thirteen million, eight hundred seventy-five thousand, two hundred fifty-one".