51949213 has 2 divisors, whose sum is σ = 51949214. Its totient is φ = 51949212.

The previous prime is 51949207. The next prime is 51949243. The reversal of 51949213 is 31294915.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 30669444 + 21279769 = 5538^2 + 4613^2 .

It is a cyclic number.

It is not a de Polignac number, because 51949213 - 2⁵ = 51949181 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51949243) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25974606 + 25974607.

It is an arithmetic number, because the mean of its divisors is an integer number (25974607).

Almost surely, 2^51949213 is an apocalyptic number.

It is an amenable number.

51949213 is a deficient number, since it is larger than the sum of its proper divisors (1).

51949213 is an equidigital number, since it uses as much as digits as its factorization.

51949213 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9720, while the sum is 34.

The square root of 51949213 is about 7207.5802458245. The cubic root of 51949213 is about 373.1295613283.

The spelling of 51949213 in words is "fifty-one million, nine hundred forty-nine thousand, two hundred thirteen".