51167521 has 2 divisors, whose sum is σ = 51167522. Its totient is φ = 51167520.

The previous prime is 51167497. The next prime is 51167527. The reversal of 51167521 is 12576115.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 50922496 + 245025 = 7136^2 + 495^2 .

It is a cyclic number.

It is not a de Polignac number, because 51167521 - 2⁷ = 51167393 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 51167521.

It is not a weakly prime, because it can be changed into another prime (51167527) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25583760 + 25583761.

It is an arithmetic number, because the mean of its divisors is an integer number (25583761).

Almost surely, 2^51167521 is an apocalyptic number.

It is an amenable number.

51167521 is a deficient number, since it is larger than the sum of its proper divisors (1).

51167521 is an equidigital number, since it uses as much as digits as its factorization.

51167521 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2100, while the sum is 28.

The square root of 51167521 is about 7153.1476288414. The cubic root of 51167521 is about 371.2485722868.

The spelling of 51167521 in words is "fifty-one million, one hundred sixty-seven thousand, five hundred twenty-one".