161465573 has 4 divisors (see below), whose sum is σ = 163739808. Its totient is φ = 159191340.

The previous prime is 161465567. The next prime is 161465599. The reversal of 161465573 is 375564161.

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: 375564161 = 7 ⋅53652023.

It is a cyclic number.

It is not a de Polignac number, because 161465573 - 2¹⁶ = 161400037 is a prime.

It is a super-2 number, since 2×161465573² = 52142262528436658, 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 (161462573) 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, 1137011 + ... + 1137152.

It is an arithmetic number, because the mean of its divisors is an integer number (40934952).

Almost surely, 2^161465573 is an apocalyptic number.

It is an amenable number.

161465573 is a deficient number, since it is larger than the sum of its proper divisors (2274235).

161465573 is an equidigital number, since it uses as much as digits as its factorization.

161465573 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2274234.

The product of its digits is 75600, while the sum is 38.

The square root of 161465573 is about 12706.9104427473. The cubic root of 161465573 is about 544.5360617058.

The spelling of 161465573 in words is "one hundred sixty-one million, four hundred sixty-five thousand, five hundred seventy-three".