32161309 has 4 divisors (see below), whose sum is σ = 32175360. Its totient is φ = 32147260.

The previous prime is 32161303. The next prime is 32161333. The reversal of 32161309 is 90316123.

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: 90316123 = 4649 ⋅19427.

It is a cyclic number.

It is not a de Polignac number, because 32161309 - 2⁵ = 32161277 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (32161303) 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, 2707 + ... + 8464.

It is an arithmetic number, because the mean of its divisors is an integer number (8043840).

Almost surely, 2^32161309 is an apocalyptic number.

It is an amenable number.

32161309 is a deficient number, since it is larger than the sum of its proper divisors (14051).

32161309 is a wasteful number, since it uses less digits than its factorization.

32161309 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14050.

The product of its (nonzero) digits is 972, while the sum is 25.

The square root of 32161309 is about 5671.0941625052. The cubic root of 32161309 is about 318.0127791761.

The spelling of 32161309 in words is "thirty-two million, one hundred sixty-one thousand, three hundred nine".