51449081 has 2 divisors, whose sum is σ = 51449082. Its totient is φ = 51449080.

The previous prime is 51449077. The next prime is 51449141. The reversal of 51449081 is 18094415.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 32959081 + 18490000 = 5741^2 + 4300^2 .

It is a cyclic number.

It is not a de Polignac number, because 51449081 - 2² = 51449077 is a prime.

It is a super-2 number, since 2×51449081² = 5294015871489122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (51449011) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25724540 + 25724541.

It is an arithmetic number, because the mean of its divisors is an integer number (25724541).

Almost surely, 2^51449081 is an apocalyptic number.

It is an amenable number.

51449081 is a deficient number, since it is larger than the sum of its proper divisors (1).

51449081 is an equidigital number, since it uses as much as digits as its factorization.

51449081 is an evil number, because the sum of its binary digits is even.

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

The square root of 51449081 is about 7172.8014750166. The cubic root of 51449081 is about 371.9282847263.

The spelling of 51449081 in words is "fifty-one million, four hundred forty-nine thousand, eighty-one".