211256051 has 4 divisors (see below), whose sum is σ = 216965712. Its totient is φ = 205546392.

The previous prime is 211256047. The next prime is 211256053. The reversal of 211256051 is 150652112.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 211256051 - 2² = 211256047 is a prime.

It is a super-2 number, since 2×211256051² = 89258238168229202, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (211256053) 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, 2854775 + ... + 2854848.

It is an arithmetic number, because the mean of its divisors is an integer number (54241428).

Almost surely, 2^211256051 is an apocalyptic number.

211256051 is a deficient number, since it is larger than the sum of its proper divisors (5709661).

211256051 is an equidigital number, since it uses as much as digits as its factorization.

211256051 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5709660.

The product of its (nonzero) digits is 600, while the sum is 23.

The square root of 211256051 is about 14534.6500129862. The cubic root of 211256051 is about 595.5748989965.

The spelling of 211256051 in words is "two hundred eleven million, two hundred fifty-six thousand, fifty-one".