12999161 has 12 divisors (see below), whose sum is σ = 15372900. Its totient is φ = 10956960.

The previous prime is 12999157. The next prime is 12999179. The reversal of 12999161 is 16199921.

It can be written as a sum of positive squares in 2 ways, for example, as 354025 + 12645136 = 595^2 + 3556^2 .

It is not a de Polignac number, because 12999161 - 2² = 12999157 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12999131) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 815 + ... + 5163.

It is an arithmetic number, because the mean of its divisors is an integer number (1281075).

Almost surely, 2^12999161 is an apocalyptic number.

It is an amenable number.

12999161 is a deficient number, since it is larger than the sum of its proper divisors (2373739).

12999161 is an equidigital number, since it uses as much as digits as its factorization.

12999161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4424 (or 4417 counting only the distinct ones).

The product of its digits is 8748, while the sum is 38.

The square root of 12999161 is about 3605.4349252205. The cubic root of 12999161 is about 235.1284102791.

The spelling of 12999161 in words is "twelve million, nine hundred ninety-nine thousand, one hundred sixty-one".