82145691 has 16 divisors (see below), whose sum is σ = 125624320. Its totient is φ = 52996680.

The previous prime is 82145671. The next prime is 82145731. The reversal of 82145691 is 19654128.

82145691 is a `hidden beast` number, since 82 + 14 + 569 + 1 = 666.

It is not a de Polignac number, because 82145691 - 2¹⁸ = 81883547 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (82145671) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 48235 + ... + 49908.

It is an arithmetic number, because the mean of its divisors is an integer number (7851520).

Almost surely, 2^82145691 is an apocalyptic number.

82145691 is a deficient number, since it is larger than the sum of its proper divisors (43478629).

82145691 is a wasteful number, since it uses less digits than its factorization.

82145691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 98183 (or 98177 counting only the distinct ones).

The product of its digits is 17280, while the sum is 36.

The square root of 82145691 is about 9063.4260078626. The cubic root of 82145691 is about 434.7052938461.

The spelling of 82145691 in words is "eighty-two million, one hundred forty-five thousand, six hundred ninety-one".