32161645 has 4 divisors (see below), whose sum is σ = 38593980. Its totient is φ = 25729312.

The previous prime is 32161573. The next prime is 32161669. The reversal of 32161645 is 54616123.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 54616123 = 59 ⋅925697.

It can be written as a sum of positive squares in 2 ways, for example, as 20912329 + 11249316 = 4573^2 + 3354^2 .

It is a cyclic number.

It is not a de Polignac number, because 32161645 - 2⁷ = 32161517 is a prime.

It is a super-3 number, since 3×32161645³ (a number of 23 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3216160 + ... + 3216169.

It is an arithmetic number, because the mean of its divisors is an integer number (9648495).

Almost surely, 2^32161645 is an apocalyptic number.

It is an amenable number.

32161645 is a deficient number, since it is larger than the sum of its proper divisors (6432335).

32161645 is an equidigital number, since it uses as much as digits as its factorization.

32161645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6432334.

The product of its digits is 4320, while the sum is 28.

The square root of 32161645 is about 5671.1237863408. The cubic root of 32161645 is about 318.0138866343.

Adding to 32161645 its reverse (54616123), we get a palindrome (86777768).

The spelling of 32161645 in words is "thirty-two million, one hundred sixty-one thousand, six hundred forty-five".