51492281 has 2 divisors, whose sum is σ = 51492282. Its totient is φ = 51492280.

The previous prime is 51492257. The next prime is 51492289. The reversal of 51492281 is 18229415.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 50282281 + 1210000 = 7091^2 + 1100^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51492281 is a prime.

It is a super-2 number, since 2×51492281² = 5302910005165922, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (51492289) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25746140 + 25746141.

It is an arithmetic number, because the mean of its divisors is an integer number (25746141).

Almost surely, 2^51492281 is an apocalyptic number.

It is an amenable number.

51492281 is a deficient number, since it is larger than the sum of its proper divisors (1).

51492281 is an equidigital number, since it uses as much as digits as its factorization.

51492281 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5760, while the sum is 32.

The square root of 51492281 is about 7175.8122188363. The cubic root of 51492281 is about 372.0323540095.

The spelling of 51492281 in words is "fifty-one million, four hundred ninety-two thousand, two hundred eighty-one".