51587749 has 2 divisors, whose sum is σ = 51587750. Its totient is φ = 51587748.

The previous prime is 51587743. The next prime is 51587759. The reversal of 51587749 is 94778515.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 29778849 + 21808900 = 5457^2 + 4670^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51587749 is a prime.

It is a super-2 number, since 2×51587749² = 5322591693774002, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 51587699 and 51587708.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51587743) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25793874 + 25793875.

It is an arithmetic number, because the mean of its divisors is an integer number (25793875).

Almost surely, 2^51587749 is an apocalyptic number.

It is an amenable number.

51587749 is a deficient number, since it is larger than the sum of its proper divisors (1).

51587749 is an equidigital number, since it uses as much as digits as its factorization.

51587749 is an evil number, because the sum of its binary digits is even.

The product of its digits is 352800, while the sum is 46.

The square root of 51587749 is about 7182.4612076920. The cubic root of 51587749 is about 372.2621312159.

The spelling of 51587749 in words is "fifty-one million, five hundred eighty-seven thousand, seven hundred forty-nine".