161875489 has 4 divisors (see below), whose sum is σ = 162017280. Its totient is φ = 161733700.

The previous prime is 161875487. The next prime is 161875507. The reversal of 161875489 is 984578161.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 984578161 = 7 ⋅140654023.

It is a cyclic number.

It is not a de Polignac number, because 161875489 - 2¹ = 161875487 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (161875487) 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, 69169 + ... + 71470.

It is an arithmetic number, because the mean of its divisors is an integer number (40504320).

Almost surely, 2^161875489 is an apocalyptic number.

It is an amenable number.

161875489 is a deficient number, since it is larger than the sum of its proper divisors (141791).

161875489 is a wasteful number, since it uses less digits than its factorization.

161875489 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 141790.

The product of its digits is 483840, while the sum is 49.

The square root of 161875489 is about 12723.0298671346. The cubic root of 161875489 is about 544.9964806327.

The spelling of 161875489 in words is "one hundred sixty-one million, eight hundred seventy-five thousand, four hundred eighty-nine".