82697991 has 16 divisors (see below), whose sum is σ = 111492576. Its totient is φ = 54521856.

The previous prime is 82697981. The next prime is 82698059. The reversal of 82697991 is 19979628.

It is a happy number.

It is not a de Polignac number, because 82697991 - 2¹⁴ = 82681607 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (82697941) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 134601 + ... + 135213.

It is an arithmetic number, because the mean of its divisors is an integer number (6968286).

Almost surely, 2^82697991 is an apocalyptic number.

82697991 is a deficient number, since it is larger than the sum of its proper divisors (28794585).

82697991 is a wasteful number, since it uses less digits than its factorization.

82697991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1042.

The product of its digits is 489888, while the sum is 51.

The square root of 82697991 is about 9093.8435768381. The cubic root of 82697991 is about 435.6773540215.

The spelling of 82697991 in words is "eighty-two million, six hundred ninety-seven thousand, nine hundred ninety-one".