51425749 has 2 divisors, whose sum is σ = 51425750. Its totient is φ = 51425748.

The previous prime is 51425743. The next prime is 51425771. The reversal of 51425749 is 94752415.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 32285124 + 19140625 = 5682^2 + 4375^2 .

It is a cyclic number.

It is not a de Polignac number, because 51425749 - 2⁹ = 51425237 is a prime.

It is a super-2 number, since 2×51425749² = 5289215320422002, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51425743) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25712874 + 25712875.

It is an arithmetic number, because the mean of its divisors is an integer number (25712875).

Almost surely, 2^51425749 is an apocalyptic number.

It is an amenable number.

51425749 is a deficient number, since it is larger than the sum of its proper divisors (1).

51425749 is an equidigital number, since it uses as much as digits as its factorization.

51425749 is an evil number, because the sum of its binary digits is even.

The product of its digits is 50400, while the sum is 37.

The square root of 51425749 is about 7171.1748688761. The cubic root of 51425749 is about 371.8720534475.

The spelling of 51425749 in words is "fifty-one million, four hundred twenty-five thousand, seven hundred forty-nine".