51447521 has 2 divisors, whose sum is σ = 51447522. Its totient is φ = 51447520.

The previous prime is 51447509. The next prime is 51447533. The reversal of 51447521 is 12574415.

It is a balanced prime because it is at equal distance from previous prime (51447509) and next prime (51447533).

It can be written as a sum of positive squares in only one way, i.e., 43824400 + 7623121 = 6620^2 + 2761^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51447521 is a prime.

It is not a weakly prime, because it can be changed into another prime (51447541) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25723760 + 25723761.

It is an arithmetic number, because the mean of its divisors is an integer number (25723761).

Almost surely, 2^51447521 is an apocalyptic number.

It is an amenable number.

51447521 is a deficient number, since it is larger than the sum of its proper divisors (1).

51447521 is an equidigital number, since it uses as much as digits as its factorization.

51447521 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5600, while the sum is 29.

The square root of 51447521 is about 7172.6927300701. The cubic root of 51447521 is about 371.9245255792.

The spelling of 51447521 in words is "fifty-one million, four hundred forty-seven thousand, five hundred twenty-one".