51437521 has 2 divisors, whose sum is σ = 51437522. Its totient is φ = 51437520.

The previous prime is 51437509. The next prime is 51437537. The reversal of 51437521 is 12573415.

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., 46771921 + 4665600 = 6839^2 + 2160^2 .

It is a cyclic number.

It is not a de Polignac number, because 51437521 - 2¹⁷ = 51306449 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 51437521.

It is not a weakly prime, because it can be changed into another prime (51437021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25718760 + 25718761.

It is an arithmetic number, because the mean of its divisors is an integer number (25718761).

Almost surely, 2^51437521 is an apocalyptic number.

It is an amenable number.

51437521 is a deficient number, since it is larger than the sum of its proper divisors (1).

51437521 is an equidigital number, since it uses as much as digits as its factorization.

51437521 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4200, while the sum is 28.

The square root of 51437521 is about 7171.9956079183. The cubic root of 51437521 is about 371.9004266775.

The spelling of 51437521 in words is "fifty-one million, four hundred thirty-seven thousand, five hundred twenty-one".