32431621 has 4 divisors (see below), whose sum is σ = 32630752. Its totient is φ = 32232492.

The previous prime is 32431591. The next prime is 32431639. The reversal of 32431621 is 12613423.

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: 12613423 = 367 ⋅34369.

It is a cyclic number.

It is not a de Polignac number, because 32431621 - 2⁷ = 32431493 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 32431592 and 32431601.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (32431691) 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, 99321 + ... + 99646.

It is an arithmetic number, because the mean of its divisors is an integer number (8157688).

Almost surely, 2^32431621 is an apocalyptic number.

It is an amenable number.

32431621 is a deficient number, since it is larger than the sum of its proper divisors (199131).

32431621 is a wasteful number, since it uses less digits than its factorization.

32431621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 199130.

The product of its digits is 864, while the sum is 22.

The square root of 32431621 is about 5694.8767326431. The cubic root of 32431621 is about 318.9012479186.

It can be divided in two parts, 3243 and 1621, that multiplied together give a triangular number (5256903 = T₃₂₄₂).

The spelling of 32431621 in words is "thirty-two million, four hundred thirty-one thousand, six hundred twenty-one".