99161380201 has 9 divisors (see below), whose sum is σ = 107380365399. Its totient is φ = 91529802936.

The previous prime is 99161380193. The next prime is 99161380223. The reversal of 99161380201 is 10208316199.

The square root of 99161380201 is 314899.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 14668843225 + 84492536976 = 121115^2 + 290676^2 .

It is not a de Polignac number, because 99161380201 - 2³ = 99161380193 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (99161380301) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 4081576 + ... + 4105798.

It is an arithmetic number, because the mean of its divisors is an integer number (11931151711).

Almost surely, 2^99161380201 is an apocalyptic number.

99161380201 is the 314899-th square number.

99161380201 is the 157450-th centered octagonal number.

It is an amenable number.

99161380201 is a deficient number, since it is larger than the sum of its proper divisors (8218985198).

99161380201 is an frugal number, since it uses more digits than its factorization.

99161380201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48472 (or 24236 counting only the distinct ones).

The product of its (nonzero) digits is 23328, while the sum is 40.

The spelling of 99161380201 in words is "ninety-nine billion, one hundred sixty-one million, three hundred eighty thousand, two hundred one".