32099981 has 4 divisors (see below), whose sum is σ = 32153472. Its totient is φ = 32046492.

The previous prime is 32099959. The next prime is 32099989. The reversal of 32099981 is 18999023.

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: 18999023 = 137 ⋅138679.

It is a cyclic number.

It is not a de Polignac number, because 32099981 - 2⁶ = 32099917 is a prime.

It is a super-2 number, since 2×32099981² = 2060817560400722, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (32099989) 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, 25835 + ... + 27048.

It is an arithmetic number, because the mean of its divisors is an integer number (8038368).

Almost surely, 2^32099981 is an apocalyptic number.

It is an amenable number.

32099981 is a deficient number, since it is larger than the sum of its proper divisors (53491).

32099981 is an equidigital number, since it uses as much as digits as its factorization.

32099981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53490.

The product of its (nonzero) digits is 34992, while the sum is 41.

The square root of 32099981 is about 5665.6845129252. The cubic root of 32099981 is about 317.8105123508.

The spelling of 32099981 in words is "thirty-two million, ninety-nine thousand, nine hundred eighty-one".