83440521 has 6 divisors (see below), whose sum is σ = 120525210. Its totient is φ = 55627008.

The previous prime is 83440517. The next prime is 83440529. The reversal of 83440521 is 12504438.

It can be written as a sum of positive squares in only one way, i.e., 76737600 + 6702921 = 8760^2 + 2589^2 .

It is not a de Polignac number, because 83440521 - 2² = 83440517 is a prime.

It is not an unprimeable number, because it can be changed into a prime (83440529) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4635576 + ... + 4635593.

It is an arithmetic number, because the mean of its divisors is an integer number (20087535).

Almost surely, 2^83440521 is an apocalyptic number.

It is an amenable number.

83440521 is a deficient number, since it is larger than the sum of its proper divisors (37084689).

83440521 is a wasteful number, since it uses less digits than its factorization.

83440521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9271175 (or 9271172 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 27.

The square root of 83440521 is about 9134.5783153904. The cubic root of 83440521 is about 436.9774262349.

Adding to 83440521 its reverse (12504438), we get a palindrome (95944959).

The spelling of 83440521 in words is "eighty-three million, four hundred forty thousand, five hundred twenty-one".