32991121 has 4 divisors (see below), whose sum is σ = 33011892. Its totient is φ = 32970352.

The previous prime is 32991103. The next prime is 32991137. The reversal of 32991121 is 12119923.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 5017600 + 27973521 = 2240^2 + 5289^2 .

It is a cyclic number.

It is not a de Polignac number, because 32991121 - 2¹⁷ = 32860049 is a prime.

It is a super-3 number, since 3×32991121³ (a number of 24 digits) contains 333 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 32991121.

It is not an unprimeable number, because it can be changed into a prime (32991151) 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, 7786 + ... + 11251.

It is an arithmetic number, because the mean of its divisors is an integer number (8252973).

Almost surely, 2^32991121 is an apocalyptic number.

It is an amenable number.

32991121 is a deficient number, since it is larger than the sum of its proper divisors (20771).

32991121 is a wasteful number, since it uses less digits than its factorization.

32991121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20770.

The product of its digits is 972, while the sum is 28.

The square root of 32991121 is about 5743.7897767937. The cubic root of 32991121 is about 320.7246630481.

The spelling of 32991121 in words is "thirty-two million, nine hundred ninety-one thousand, one hundred twenty-one".