82497991 has 8 divisors (see below), whose sum is σ = 87858864. Its totient is φ = 77193600.

The previous prime is 82497949. The next prime is 82498001. The reversal of 82497991 is 19979428.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 82497991 - 2¹¹ = 82495943 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 (82497931) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11085 + ... + 16966.

It is an arithmetic number, because the mean of its divisors is an integer number (10982358).

Almost surely, 2^82497991 is an apocalyptic number.

82497991 is a deficient number, since it is larger than the sum of its proper divisors (5360873).

82497991 is a wasteful number, since it uses less digits than its factorization.

82497991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28241.

The product of its digits is 326592, while the sum is 49.

The square root of 82497991 is about 9082.8404698090. The cubic root of 82497991 is about 435.3258508866.

The spelling of 82497991 in words is "eighty-two million, four hundred ninety-seven thousand, nine hundred ninety-one".