51949181 has 2 divisors, whose sum is σ = 51949182. Its totient is φ = 51949180.

The previous prime is 51949171. The next prime is 51949189. The reversal of 51949181 is 18194915.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 41925625 + 10023556 = 6475^2 + 3166^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51949181 is a prime.

It is a super-2 number, since 2×51949181² = 5397434813141522, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51949189) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25974590 + 25974591.

It is an arithmetic number, because the mean of its divisors is an integer number (25974591).

Almost surely, 2^51949181 is an apocalyptic number.

It is an amenable number.

51949181 is a deficient number, since it is larger than the sum of its proper divisors (1).

51949181 is an equidigital number, since it uses as much as digits as its factorization.

51949181 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 12960, while the sum is 38.

The square root of 51949181 is about 7207.5780259391. The cubic root of 51949181 is about 373.1294847141.

The spelling of 51949181 in words is "fifty-one million, nine hundred forty-nine thousand, one hundred eighty-one".