83121415 has 16 divisors (see below), whose sum is σ = 113738688. Its totient is φ = 57770496.

The previous prime is 83121407. The next prime is 83121443. The reversal of 83121415 is 51412138.

It is a cyclic number.

It is not a de Polignac number, because 83121415 - 2³ = 83121407 is a prime.

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 83121415.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 36507 + ... + 38716.

It is an arithmetic number, because the mean of its divisors is an integer number (7108668).

Almost surely, 2^83121415 is an apocalyptic number.

83121415 is a gapful number since it is divisible by the number (85) formed by its first and last digit.

83121415 is a deficient number, since it is larger than the sum of its proper divisors (30617273).

83121415 is a wasteful number, since it uses less digits than its factorization.

83121415 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 75258.

The product of its digits is 960, while the sum is 25.

The square root of 83121415 is about 9117.0946578392. The cubic root of 83121415 is about 436.4196626361.

The spelling of 83121415 in words is "eighty-three million, one hundred twenty-one thousand, four hundred fifteen".