83521311 has 8 divisors (see below), whose sum is σ = 112402944. Its totient is φ = 55160280.

The previous prime is 83521307. The next prime is 83521337. The reversal of 83521311 is 11312538.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 83521311 - 2² = 83521307 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (83521381) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 129775 + ... + 130416.

It is an arithmetic number, because the mean of its divisors is an integer number (14050368).

Almost surely, 2^83521311 is an apocalyptic number.

83521311 is a deficient number, since it is larger than the sum of its proper divisors (28881633).

83521311 is a wasteful number, since it uses less digits than its factorization.

83521311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 260301.

The product of its digits is 720, while the sum is 24.

The square root of 83521311 is about 9138.9994528942. Note that the first 3 decimals coincide. The cubic root of 83521311 is about 437.1184129640.

Adding to 83521311 its reverse (11312538), we get a palindrome (94833849).

The spelling of 83521311 in words is "eighty-three million, five hundred twenty-one thousand, three hundred eleven".