83821015 has 16 divisors (see below), whose sum is σ = 104743296. Its totient is φ = 64339200.

The previous prime is 83821013. The next prime is 83821043. The reversal of 83821015 is 51012838.

It is not a de Polignac number, because 83821015 - 2¹ = 83821013 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 (83821013) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9154 + ... + 15856.

It is an arithmetic number, because the mean of its divisors is an integer number (6546456).

Almost surely, 2^83821015 is an apocalyptic number.

83821015 is a deficient number, since it is larger than the sum of its proper divisors (20922281).

83821015 is a wasteful number, since it uses less digits than its factorization.

83821015 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6810.

The product of its (nonzero) digits is 1920, while the sum is 28.

The square root of 83821015 is about 9155.3817506426. The cubic root of 83821015 is about 437.6406339722.

The spelling of 83821015 in words is "eighty-three million, eight hundred twenty-one thousand, fifteen".