161579497 has 8 divisors (see below), whose sum is σ = 163654920. Its totient is φ = 159513600.

The previous prime is 161579489. The next prime is 161579507. The reversal of 161579497 is 794975161.

It can be written as a sum of positive squares in 4 ways, for example, as 111112681 + 50466816 = 10541^2 + 7104^2 .

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 161579497 - 2³ = 161579489 is a prime.

It is a super-2 number, since 2×161579497² = 52215867701546018, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 161579497.

It is not an unprimeable number, because it can be changed into a prime (161579447) 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, 35529 + ... + 39817.

It is an arithmetic number, because the mean of its divisors is an integer number (20456865).

Almost surely, 2^161579497 is an apocalyptic number.

It is an amenable number.

161579497 is a deficient number, since it is larger than the sum of its proper divisors (2075423).

161579497 is a wasteful number, since it uses less digits than its factorization.

161579497 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4763.

The product of its digits is 476280, while the sum is 49.

The square root of 161579497 is about 12711.3924099604. The cubic root of 161579497 is about 544.6640996127.

The spelling of 161579497 in words is "one hundred sixty-one million, five hundred seventy-nine thousand, four hundred ninety-seven".