83121517 has 8 divisors (see below), whose sum is σ = 91838016. Its totient is φ = 74830272.

The previous prime is 83121491. The next prime is 83121541. The reversal of 83121517 is 71512138.

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

It is a cyclic number.

It is not a de Polignac number, because 83121517 - 2¹¹ = 83119469 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (83121217) 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, 105903 + ... + 106684.

It is an arithmetic number, because the mean of its divisors is an integer number (11479752).

Almost surely, 2^83121517 is an apocalyptic number.

It is an amenable number.

83121517 is a deficient number, since it is larger than the sum of its proper divisors (8716499).

83121517 is a wasteful number, since it uses less digits than its factorization.

83121517 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 212627.

The product of its digits is 1680, while the sum is 28.

The square root of 83121517 is about 9117.1002517248. The cubic root of 83121517 is about 436.4198411492.

It can be divided in two parts, 83121 and 517, that added together give a palindrome (83638).

The spelling of 83121517 in words is "eighty-three million, one hundred twenty-one thousand, five hundred seventeen".