51398761 has 2 divisors, whose sum is σ = 51398762. Its totient is φ = 51398760.

The previous prime is 51398749. The next prime is 51398771. The reversal of 51398761 is 16789315.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 50851161 + 547600 = 7131^2 + 740^2 .

It is a cyclic number.

It is not a de Polignac number, because 51398761 - 2⁵ = 51398729 is a prime.

It is not a weakly prime, because it can be changed into another prime (51398731) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25699380 + 25699381.

It is an arithmetic number, because the mean of its divisors is an integer number (25699381).

Almost surely, 2^51398761 is an apocalyptic number.

It is an amenable number.

51398761 is a deficient number, since it is larger than the sum of its proper divisors (1).

51398761 is an equidigital number, since it uses as much as digits as its factorization.

51398761 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 45360, while the sum is 40.

The square root of 51398761 is about 7169.2929218996. The cubic root of 51398761 is about 371.8069898083.

The spelling of 51398761 in words is "fifty-one million, three hundred ninety-eight thousand, seven hundred sixty-one".