99321157 has 8 divisors (see below), whose sum is σ = 113253336. Its totient is φ = 86287872.

The previous prime is 99321121. The next prime is 99321163. The reversal of 99321157 is 75112399.

It is a Cunningham number, because it is equal to 9966²+1.

It can be written as a sum of positive squares in 4 ways, for example, as 1 + 99321156 = 1^2 + 9966^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 99321157 - 2⁷ = 99321029 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99321197) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 224488 + ... + 224929.

It is an arithmetic number, because the mean of its divisors is an integer number (14156667).

Almost surely, 2^99321157 is an apocalyptic number.

It is an amenable number.

99321157 is a deficient number, since it is larger than the sum of its proper divisors (13932179).

99321157 is a wasteful number, since it uses less digits than its factorization.

99321157 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 449447.

The product of its digits is 17010, while the sum is 37.

The square root of 99321157 is about 9966.0000501706. Note that the first 4 decimals coincide. The cubic root of 99321157 is about 463.1061943576.

The spelling of 99321157 in words is "ninety-nine million, three hundred twenty-one thousand, one hundred fifty-seven".