82612991 has 4 divisors (see below), whose sum is σ = 84627984. Its totient is φ = 80598000.

The previous prime is 82612963. The next prime is 82612993. The reversal of 82612991 is 19921628.

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 82612991 - 2¹⁰ = 82611967 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 (82612993) 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 3 ways as a sum of consecutive naturals, for example, 1007435 + ... + 1007516.

It is an arithmetic number, because the mean of its divisors is an integer number (21156996).

Almost surely, 2^82612991 is an apocalyptic number.

82612991 is a deficient number, since it is larger than the sum of its proper divisors (2014993).

82612991 is a wasteful number, since it uses less digits than its factorization.

82612991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2014992.

The product of its digits is 15552, while the sum is 38.

The square root of 82612991 is about 9089.1688838969. The cubic root of 82612991 is about 435.5280345129.

The spelling of 82612991 in words is "eighty-two million, six hundred twelve thousand, nine hundred ninety-one".