51495181 has 2 divisors, whose sum is σ = 51495182. Its totient is φ = 51495180.

The previous prime is 51495173. The next prime is 51495211. The reversal of 51495181 is 18159415.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 39175081 + 12320100 = 6259^2 + 3510^2 .

It is a cyclic number.

It is not a de Polignac number, because 51495181 - 2³ = 51495173 is a prime.

It is a super-2 number, since 2×51495181² = 5303507332445522, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51495121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25747590 + 25747591.

It is an arithmetic number, because the mean of its divisors is an integer number (25747591).

Almost surely, 2^51495181 is an apocalyptic number.

It is an amenable number.

51495181 is a deficient number, since it is larger than the sum of its proper divisors (1).

51495181 is an equidigital number, since it uses as much as digits as its factorization.

51495181 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7200, while the sum is 34.

The square root of 51495181 is about 7176.0142837093. The cubic root of 51495181 is about 372.0393380568.

The spelling of 51495181 in words is "fifty-one million, four hundred ninety-five thousand, one hundred eighty-one".