51118961 has 2 divisors, whose sum is σ = 51118962. Its totient is φ = 51118960.

The previous prime is 51118937. The next prime is 51118979. The reversal of 51118961 is 16981115.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 35760400 + 15358561 = 5980^2 + 3919^2 .

It is a cyclic number.

It is not a de Polignac number, because 51118961 - 2¹⁴ = 51102577 is a prime.

It is a super-2 number, since 2×51118961² = 5226296347439042, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (51118901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25559480 + 25559481.

It is an arithmetic number, because the mean of its divisors is an integer number (25559481).

Almost surely, 2^51118961 is an apocalyptic number.

It is an amenable number.

51118961 is a deficient number, since it is larger than the sum of its proper divisors (1).

51118961 is an equidigital number, since it uses as much as digits as its factorization.

51118961 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2160, while the sum is 32.

The square root of 51118961 is about 7149.7525131993. The cubic root of 51118961 is about 371.1310919245.

The spelling of 51118961 in words is "fifty-one million, one hundred eighteen thousand, nine hundred sixty-one".