99990161 has 2 divisors, whose sum is σ = 99990162. Its totient is φ = 99990160.

The previous prime is 99990139. The next prime is 99990181. The reversal of 99990161 is 16109999.

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., 91317136 + 8673025 = 9556^2 + 2945^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-99990161 is a prime.

It is not a weakly prime, because it can be changed into another prime (99990181) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49995080 + 49995081.

It is an arithmetic number, because the mean of its divisors is an integer number (49995081).

Almost surely, 2^99990161 is an apocalyptic number.

It is an amenable number.

99990161 is a deficient number, since it is larger than the sum of its proper divisors (1).

99990161 is an equidigital number, since it uses as much as digits as its factorization.

99990161 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 39366, while the sum is 44.

The square root of 99990161 is about 9999.5080378987. The cubic root of 99990161 is about 464.1436599978.

The spelling of 99990161 in words is "ninety-nine million, nine hundred ninety thousand, one hundred sixty-one".