99537509 has 2 divisors, whose sum is σ = 99537510. Its totient is φ = 99537508.

The previous prime is 99537479. The next prime is 99537547. The reversal of 99537509 is 90573599.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 98208100 + 1329409 = 9910^2 + 1153^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-99537509 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (99537569) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49768754 + 49768755.

It is an arithmetic number, because the mean of its divisors is an integer number (49768755).

Almost surely, 2^99537509 is an apocalyptic number.

It is an amenable number.

99537509 is a deficient number, since it is larger than the sum of its proper divisors (1).

99537509 is an equidigital number, since it uses as much as digits as its factorization.

99537509 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 382725, while the sum is 47.

The square root of 99537509 is about 9976.8486507514. The cubic root of 99537509 is about 463.4422130241.

The spelling of 99537509 in words is "ninety-nine million, five hundred thirty-seven thousand, five hundred nine".