83911997 has 4 divisors (see below), whose sum is σ = 90366780. Its totient is φ = 77457216.

The previous prime is 83911973. The next prime is 83912011. The reversal of 83911997 is 79911938.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 10278436 + 73633561 = 3206^2 + 8581^2 .

It is a cyclic number.

It is not a de Polignac number, because 83911997 - 2⁸ = 83911741 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 (83911097) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3227372 + ... + 3227397.

It is an arithmetic number, because the mean of its divisors is an integer number (22591695).

Almost surely, 2^83911997 is an apocalyptic number.

It is an amenable number.

83911997 is a deficient number, since it is larger than the sum of its proper divisors (6454783).

83911997 is a wasteful number, since it uses less digits than its factorization.

83911997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6454782.

The product of its digits is 122472, while the sum is 47.

The square root of 83911997 is about 9160.3491745675. The cubic root of 83911997 is about 437.7989197452.

The spelling of 83911997 in words is "eighty-three million, nine hundred eleven thousand, nine hundred ninety-seven".