99808537 has 2 divisors, whose sum is σ = 99808538. Its totient is φ = 99808536.

The previous prime is 99808531. The next prime is 99808571. The reversal of 99808537 is 73580899.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 95824521 + 3984016 = 9789^2 + 1996^2 .

It is a cyclic number.

It is not a de Polignac number, because 99808537 - 2³ = 99808529 is a prime.

It is a super-3 number, since 3×99808537³ (a number of 25 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (99808531) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49904268 + 49904269.

It is an arithmetic number, because the mean of its divisors is an integer number (49904269).

Almost surely, 2^99808537 is an apocalyptic number.

It is an amenable number.

99808537 is a deficient number, since it is larger than the sum of its proper divisors (1).

99808537 is an equidigital number, since it uses as much as digits as its factorization.

99808537 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 544320, while the sum is 49.

The square root of 99808537 is about 9990.4222633480. The cubic root of 99808537 is about 463.8624632615.

The spelling of 99808537 in words is "ninety-nine million, eight hundred eight thousand, five hundred thirty-seven".