99761521 has 2 divisors, whose sum is σ = 99761522. Its totient is φ = 99761520.

The previous prime is 99761483. The next prime is 99761531. The reversal of 99761521 is 12516799.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 79834225 + 19927296 = 8935^2 + 4464^2 .

It is a cyclic number.

It is not a de Polignac number, because 99761521 - 2⁷ = 99761393 is a prime.

It is a super-2 number, since 2×99761521² = 19904722144466882, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (99761531) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49880760 + 49880761.

It is an arithmetic number, because the mean of its divisors is an integer number (49880761).

Almost surely, 2^99761521 is an apocalyptic number.

It is an amenable number.

99761521 is a deficient number, since it is larger than the sum of its proper divisors (1).

99761521 is an equidigital number, since it uses as much as digits as its factorization.

99761521 is an evil number, because the sum of its binary digits is even.

The product of its digits is 34020, while the sum is 40.

The square root of 99761521 is about 9988.0689324814. The cubic root of 99761521 is about 463.7896158425.

The spelling of 99761521 in words is "ninety-nine million, seven hundred sixty-one thousand, five hundred twenty-one".