161857459 has 8 divisors (see below), whose sum is σ = 171497088. Its totient is φ = 152231040.

The previous prime is 161857361. The next prime is 161857477. The reversal of 161857459 is 954758161.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 161857459 - 2¹¹ = 161855411 is a prime.

It is not an unprimeable number, because it can be changed into a prime (161857489) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 34174 + ... + 38620.

It is an arithmetic number, because the mean of its divisors is an integer number (21437136).

Almost surely, 2^161857459 is an apocalyptic number.

161857459 is a deficient number, since it is larger than the sum of its proper divisors (9639629).

161857459 is a wasteful number, since it uses less digits than its factorization.

161857459 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6605.

The product of its digits is 302400, while the sum is 46.

The square root of 161857459 is about 12722.3212897647. The cubic root of 161857459 is about 544.9762456330.

The spelling of 161857459 in words is "one hundred sixty-one million, eight hundred fifty-seven thousand, four hundred fifty-nine".