83821197 has 4 divisors (see below), whose sum is σ = 111761600. Its totient is φ = 55880796.

The previous prime is 83821193. The next prime is 83821211. The reversal of 83821197 is 79112838.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 83821197 - 2² = 83821193 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 (83821193) 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, 13970197 + ... + 13970202.

It is an arithmetic number, because the mean of its divisors is an integer number (27940400).

Almost surely, 2^83821197 is an apocalyptic number.

It is an amenable number.

83821197 is a deficient number, since it is larger than the sum of its proper divisors (27940403).

83821197 is a wasteful number, since it uses less digits than its factorization.

83821197 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27940402.

The product of its digits is 24192, while the sum is 39.

The square root of 83821197 is about 9155.3916901463. The cubic root of 83821197 is about 437.6409507207.

The spelling of 83821197 in words is "eighty-three million, eight hundred twenty-one thousand, one hundred ninety-seven".