32161537 has 4 divisors (see below), whose sum is σ = 32602180. Its totient is φ = 31720896.

The previous prime is 32161523. The next prime is 32161543. The reversal of 32161537 is 73516123.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 73516123 = 601 ⋅122323.

It can be written as a sum of positive squares in 2 ways, for example, as 18054001 + 14107536 = 4249^2 + 3756^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-32161537 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (32161517) 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, 220212 + ... + 220357.

It is an arithmetic number, because the mean of its divisors is an integer number (8150545).

Almost surely, 2^32161537 is an apocalyptic number.

It is an amenable number.

32161537 is a deficient number, since it is larger than the sum of its proper divisors (440643).

32161537 is an equidigital number, since it uses as much as digits as its factorization.

32161537 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 440642.

The product of its digits is 3780, while the sum is 28.

The square root of 32161537 is about 5671.1142644105. The cubic root of 32161537 is about 318.0135306664.

It can be divided in two parts, 3216 and 1537, that added together give a triangular number (4753 = T₉₇).

The spelling of 32161537 in words is "thirty-two million, one hundred sixty-one thousand, five hundred thirty-seven".