59721521 has 2 divisors, whose sum is σ = 59721522. Its totient is φ = 59721520.

The previous prime is 59721509. The next prime is 59721533. The reversal of 59721521 is 12512795.

59721521 = 5464² + 5465².

It is a happy number.

It is a balanced prime because it is at equal distance from previous prime (59721509) and next prime (59721533).

It can be written as a sum of positive squares in only one way, i.e., 29866225 + 29855296 = 5465^2 + 5464^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-59721521 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (59721821) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 29860760 + 29860761.

It is an arithmetic number, because the mean of its divisors is an integer number (29860761).

Almost surely, 2^59721521 is an apocalyptic number.

59721521 is the 5465-th centered square number.

It is an amenable number.

59721521 is a deficient number, since it is larger than the sum of its proper divisors (1).

59721521 is an equidigital number, since it uses as much as digits as its factorization.

59721521 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6300, while the sum is 32.

The square root of 59721521 is about 7727.9700439378. The cubic root of 59721521 is about 390.8801533080.

The spelling of 59721521 in words is "fifty-nine million, seven hundred twenty-one thousand, five hundred twenty-one".