161816597 has 8 divisors (see below), whose sum is σ = 172733760. Its totient is φ = 151139520.

The previous prime is 161816593. The next prime is 161816617. The reversal of 161816597 is 795618161.

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 161816597 - 2² = 161816593 is a prime.

It is a super-2 number, since 2×161816597² = 52369222129320818, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161816593) 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, 58628 + ... + 61325.

It is an arithmetic number, because the mean of its divisors is an integer number (21591720).

Almost surely, 2^161816597 is an apocalyptic number.

It is an amenable number.

161816597 is a deficient number, since it is larger than the sum of its proper divisors (10917163).

161816597 is a wasteful number, since it uses less digits than its factorization.

161816597 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 120043.

The product of its digits is 90720, while the sum is 44.

The square root of 161816597 is about 12720.7152707700. The cubic root of 161816597 is about 544.9303808049.

The spelling of 161816597 in words is "one hundred sixty-one million, eight hundred sixteen thousand, five hundred ninety-seven".