83572121 has 4 divisors (see below), whose sum is σ = 83590452. Its totient is φ = 83553792.

The previous prime is 83572117. The next prime is 83572123. The reversal of 83572121 is 12127538.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 12127538 = 2 ⋅6063769.

It can be written as a sum of positive squares in 2 ways, for example, as 82446400 + 1125721 = 9080^2 + 1061^2 .

It is a cyclic number.

It is not a de Polignac number, because 83572121 - 2² = 83572117 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (83572123) 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, 3605 + ... + 13421.

It is an arithmetic number, because the mean of its divisors is an integer number (20897613).

Almost surely, 2^83572121 is an apocalyptic number.

It is an amenable number.

83572121 is a deficient number, since it is larger than the sum of its proper divisors (18331).

83572121 is an equidigital number, since it uses as much as digits as its factorization.

83572121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18330.

The product of its digits is 3360, while the sum is 29.

The square root of 83572121 is about 9141.7788750330. The cubic root of 83572121 is about 437.2070349936.

Adding to 83572121 its reverse (12127538), we get a palindrome (95699659).

The spelling of 83572121 in words is "eighty-three million, five hundred seventy-two thousand, one hundred twenty-one".