82124506391 has 4 divisors (see below), whose sum is σ = 82125099792. Its totient is φ = 82123912992.

The previous prime is 82124506369. The next prime is 82124506397. The reversal of 82124506391 is 19360542128.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-82124506391 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 (82124506397) 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, 33071 + ... + 406623.

It is an arithmetic number, because the mean of its divisors is an integer number (20531274948).

Almost surely, 2^82124506391 is an apocalyptic number.

82124506391 is a deficient number, since it is larger than the sum of its proper divisors (593401).

82124506391 is a wasteful number, since it uses less digits than its factorization.

82124506391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 593400.

The product of its (nonzero) digits is 103680, while the sum is 41.

The spelling of 82124506391 in words is "eighty-two billion, one hundred twenty-four million, five hundred six thousand, three hundred ninety-one".