99927521 has 2 divisors, whose sum is σ = 99927522. Its totient is φ = 99927520.

The previous prime is 99927493. The next prime is 99927523. The reversal of 99927521 is 12572999.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 95257600 + 4669921 = 9760^2 + 2161^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-99927521 is a prime.

Together with 99927523, it forms a pair of twin primes.

It is a Chen prime.

It is equal to p_5757488 and since 99927521 and 5757488 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (99927523) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49963760 + 49963761.

It is an arithmetic number, because the mean of its divisors is an integer number (49963761).

Almost surely, 2^99927521 is an apocalyptic number.

It is an amenable number.

99927521 is a deficient number, since it is larger than the sum of its proper divisors (1).

99927521 is an equidigital number, since it uses as much as digits as its factorization.

99927521 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 102060, while the sum is 44.

The square root of 99927521 is about 9996.3753931112. The cubic root of 99927521 is about 464.0467170189.

The spelling of 99927521 in words is "ninety-nine million, nine hundred twenty-seven thousand, five hundred twenty-one".