161255345 has 4 divisors (see below), whose sum is σ = 193506420. Its totient is φ = 129004272.

The previous prime is 161255317. The next prime is 161255351. The reversal of 161255345 is 543552161.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 44528929 + 116726416 = 6673^2 + 10804^2 .

It is a cyclic number.

It is not a de Polignac number, because 161255345 - 2⁸ = 161255089 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16125530 + ... + 16125539.

It is an arithmetic number, because the mean of its divisors is an integer number (48376605).

Almost surely, 2^161255345 is an apocalyptic number.

It is an amenable number.

161255345 is a deficient number, since it is larger than the sum of its proper divisors (32251075).

161255345 is an equidigital number, since it uses as much as digits as its factorization.

161255345 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32251074.

The product of its digits is 18000, while the sum is 32.

The square root of 161255345 is about 12698.6355566258. The cubic root of 161255345 is about 544.2996306122.

The spelling of 161255345 in words is "one hundred sixty-one million, two hundred fifty-five thousand, three hundred forty-five".