161398229 has 4 divisors (see below), whose sum is σ = 161477580. Its totient is φ = 161318880.

The previous prime is 161398201. The next prime is 161398249. The reversal of 161398229 is 922893161.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 922893161 = 17 ⋅54287833.

It can be written as a sum of positive squares in 2 ways, for example, as 133287025 + 28111204 = 11545^2 + 5302^2 .

It is a cyclic number.

It is not a de Polignac number, because 161398229 - 2¹² = 161394133 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 (161398249) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 36542 + ... + 40719.

It is an arithmetic number, because the mean of its divisors is an integer number (40369395).

Almost surely, 2^161398229 is an apocalyptic number.

It is an amenable number.

161398229 is a deficient number, since it is larger than the sum of its proper divisors (79351).

161398229 is an equidigital number, since it uses as much as digits as its factorization.

161398229 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79350.

The product of its digits is 46656, while the sum is 41.

The square root of 161398229 is about 12704.2602696891. The cubic root of 161398229 is about 544.4603462136.

The spelling of 161398229 in words is "one hundred sixty-one million, three hundred ninety-eight thousand, two hundred twenty-nine".