51499181 has 2 divisors, whose sum is σ = 51499182. Its totient is φ = 51499180.

The previous prime is 51499163. The next prime is 51499183. The reversal of 51499181 is 18199415.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 28793956 + 22705225 = 5366^2 + 4765^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51499181 is a prime.

It is a super-2 number, since 2×51499181² = 5304331287341522, which contains 22 as substring.

Together with 51499183, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51499183) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25749590 + 25749591.

It is an arithmetic number, because the mean of its divisors is an integer number (25749591).

Almost surely, 2^51499181 is an apocalyptic number.

It is an amenable number.

51499181 is a deficient number, since it is larger than the sum of its proper divisors (1).

51499181 is an equidigital number, since it uses as much as digits as its factorization.

51499181 is an evil number, because the sum of its binary digits is even.

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

The square root of 51499181 is about 7176.2929845429. The cubic root of 51499181 is about 372.0489707952.

The spelling of 51499181 in words is "fifty-one million, four hundred ninety-nine thousand, one hundred eighty-one".