161601371 has 4 divisors (see below), whose sum is σ = 171107352. Its totient is φ = 152095392.

The previous prime is 161601367. The next prime is 161601389. The reversal of 161601371 is 173106161.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 173106161 = 8231 ⋅21031.

It is a cyclic number.

It is not a de Polignac number, because 161601371 - 2² = 161601367 is a prime.

It is a super-2 number, since 2×161601371² = 52230006218159282, 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 161601371.

It is not an unprimeable number, because it can be changed into a prime (161601071) 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, 4752965 + ... + 4752998.

It is an arithmetic number, because the mean of its divisors is an integer number (42776838).

Almost surely, 2^161601371 is an apocalyptic number.

161601371 is a deficient number, since it is larger than the sum of its proper divisors (9505981).

161601371 is an equidigital number, since it uses as much as digits as its factorization.

161601371 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9505980.

The product of its (nonzero) digits is 756, while the sum is 26.

The square root of 161601371 is about 12712.2527901234. The cubic root of 161601371 is about 544.6886766685.

The spelling of 161601371 in words is "one hundred sixty-one million, six hundred one thousand, three hundred seventy-one".