51425557 has 2 divisors, whose sum is σ = 51425558. Its totient is φ = 51425556.

The previous prime is 51425551. The next prime is 51425579. The reversal of 51425557 is 75552415.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 50112241 + 1313316 = 7079^2 + 1146^2 .

It is a cyclic number.

It is not a de Polignac number, because 51425557 - 2¹⁹ = 50901269 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51425551) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25712778 + 25712779.

It is an arithmetic number, because the mean of its divisors is an integer number (25712779).

Almost surely, 2^51425557 is an apocalyptic number.

It is an amenable number.

51425557 is a deficient number, since it is larger than the sum of its proper divisors (1).

51425557 is an equidigital number, since it uses as much as digits as its factorization.

51425557 is an evil number, because the sum of its binary digits is even.

The product of its digits is 35000, while the sum is 34.

The square root of 51425557 is about 7171.1614819358. The cubic root of 51425557 is about 371.8715906474.

The spelling of 51425557 in words is "fifty-one million, four hundred twenty-five thousand, five hundred fifty-seven".