51698237 has 2 divisors, whose sum is σ = 51698238. Its totient is φ = 51698236.

The previous prime is 51698209. The next prime is 51698239. The reversal of 51698237 is 73289615.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 47969476 + 3728761 = 6926^2 + 1931^2 .

It is a cyclic number.

It is not a de Polignac number, because 51698237 - 2²⁴ = 34921021 is a prime.

Together with 51698239, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 51698194 and 51698203.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51698239) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25849118 + 25849119.

It is an arithmetic number, because the mean of its divisors is an integer number (25849119).

Almost surely, 2^51698237 is an apocalyptic number.

It is an amenable number.

51698237 is a deficient number, since it is larger than the sum of its proper divisors (1).

51698237 is an equidigital number, since it uses as much as digits as its factorization.

51698237 is an evil number, because the sum of its binary digits is even.

The product of its digits is 90720, while the sum is 41.

The square root of 51698237 is about 7190.1486076437. The cubic root of 51698237 is about 372.5277057002.

The spelling of 51698237 in words is "fifty-one million, six hundred ninety-eight thousand, two hundred thirty-seven".