65099521 has 2 divisors, whose sum is σ = 65099522. Its totient is φ = 65099520.

The previous prime is 65099497. The next prime is 65099557. The reversal of 65099521 is 12599056.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 64400625 + 698896 = 8025^2 + 836^2 .

It is a cyclic number.

It is not a de Polignac number, because 65099521 - 2⁷ = 65099393 is a prime.

It is not a weakly prime, because it can be changed into another prime (65090521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32549760 + 32549761.

It is an arithmetic number, because the mean of its divisors is an integer number (32549761).

Almost surely, 2^65099521 is an apocalyptic number.

It is an amenable number.

65099521 is a deficient number, since it is larger than the sum of its proper divisors (1).

65099521 is an equidigital number, since it uses as much as digits as its factorization.

65099521 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 24300, while the sum is 37.

The square root of 65099521 is about 8068.4274180289. The cubic root of 65099521 is about 402.2776746288.

The spelling of 65099521 in words is "sixty-five million, ninety-nine thousand, five hundred twenty-one".