51179561 has 2 divisors, whose sum is σ = 51179562. Its totient is φ = 51179560.

The previous prime is 51179509. The next prime is 51179573. The reversal of 51179561 is 16597115.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 49632025 + 1547536 = 7045^2 + 1244^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51179561 is a prime.

It is not a weakly prime, because it can be changed into another prime (51179581) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25589780 + 25589781.

It is an arithmetic number, because the mean of its divisors is an integer number (25589781).

Almost surely, 2^51179561 is an apocalyptic number.

It is an amenable number.

51179561 is a deficient number, since it is larger than the sum of its proper divisors (1).

51179561 is an equidigital number, since it uses as much as digits as its factorization.

51179561 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 9450, while the sum is 35.

The square root of 51179561 is about 7153.9891668914. The cubic root of 51179561 is about 371.2776889490.

The spelling of 51179561 in words is "fifty-one million, one hundred seventy-nine thousand, five hundred sixty-one".