161281475 has 6 divisors (see below), whose sum is σ = 199989060. Its totient is φ = 129025160.

The previous prime is 161281459. The next prime is 161281501. The reversal of 161281475 is 574182161.

It is not a de Polignac number, because 161281475 - 2⁴ = 161281459 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3225605 + ... + 3225654.

It is an arithmetic number, because the mean of its divisors is an integer number (33331510).

Almost surely, 2^161281475 is an apocalyptic number.

161281475 is a deficient number, since it is larger than the sum of its proper divisors (38707585).

161281475 is an equidigital number, since it uses as much as digits as its factorization.

161281475 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6451269 (or 6451264 counting only the distinct ones).

The product of its digits is 13440, while the sum is 35.

The square root of 161281475 is about 12699.6643656437. The cubic root of 161281475 is about 544.3290286687.

The spelling of 161281475 in words is "one hundred sixty-one million, two hundred eighty-one thousand, four hundred seventy-five".