83520811 has 4 divisors (see below), whose sum is σ = 91113624. Its totient is φ = 75928000.

The previous prime is 83520809. The next prime is 83520823. The reversal of 83520811 is 11802538.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 83520811 - 2¹ = 83520809 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 83520811.

It is not an unprimeable number, because it can be changed into a prime (83520011) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3796390 + ... + 3796411.

It is an arithmetic number, because the mean of its divisors is an integer number (22778406).

Almost surely, 2^83520811 is an apocalyptic number.

83520811 is a deficient number, since it is larger than the sum of its proper divisors (7592813).

83520811 is a wasteful number, since it uses less digits than its factorization.

83520811 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7592812.

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

The square root of 83520811 is about 9138.9720975611. The cubic root of 83520811 is about 437.1175406931.

The spelling of 83520811 in words is "eighty-three million, five hundred twenty thousand, eight hundred eleven".