51993637 has 2 divisors, whose sum is σ = 51993638. Its totient is φ = 51993636.

The previous prime is 51993629. The next prime is 51993653. The reversal of 51993637 is 73639915.

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., 51394561 + 599076 = 7169^2 + 774^2 .

It is a cyclic number.

It is not a de Polignac number, because 51993637 - 2³ = 51993629 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 51993593 and 51993602.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51993677) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25996818 + 25996819.

It is an arithmetic number, because the mean of its divisors is an integer number (25996819).

Almost surely, 2^51993637 is an apocalyptic number.

It is an amenable number.

51993637 is a deficient number, since it is larger than the sum of its proper divisors (1).

51993637 is an equidigital number, since it uses as much as digits as its factorization.

51993637 is an evil number, because the sum of its binary digits is even.

The product of its digits is 153090, while the sum is 43.

The square root of 51993637 is about 7210.6613427618. The cubic root of 51993637 is about 373.2358907219.

It can be divided in two parts, 5199 and 3637, that added together give a square (8836 = 94²).

The spelling of 51993637 in words is "fifty-one million, nine hundred ninety-three thousand, six hundred thirty-seven".