51636437 has 2 divisors, whose sum is σ = 51636438. Its totient is φ = 51636436.

The previous prime is 51636427. The next prime is 51636457. The reversal of 51636437 is 73463615.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 31798321 + 19838116 = 5639^2 + 4454^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51636437 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 51636397 and 51636406.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51636427) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25818218 + 25818219.

It is an arithmetic number, because the mean of its divisors is an integer number (25818219).

Almost surely, 2^51636437 is an apocalyptic number.

It is an amenable number.

51636437 is a deficient number, since it is larger than the sum of its proper divisors (1).

51636437 is an equidigital number, since it uses as much as digits as its factorization.

51636437 is an evil number, because the sum of its binary digits is even.

The product of its digits is 45360, while the sum is 35.

The square root of 51636437 is about 7185.8497757746. The cubic root of 51636437 is about 372.3792068137.

The spelling of 51636437 in words is "fifty-one million, six hundred thirty-six thousand, four hundred thirty-seven".