82201691 has 16 divisors (see below), whose sum is σ = 98219520. Its totient is φ = 67804320.

The previous prime is 82201687. The next prime is 82201703. The reversal of 82201691 is 19610228.

It is a cyclic number.

It is not a de Polignac number, because 82201691 - 2² = 82201687 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (82201601) 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, 3566 + ... + 13308.

It is an arithmetic number, because the mean of its divisors is an integer number (6138720).

Almost surely, 2^82201691 is an apocalyptic number.

82201691 is a deficient number, since it is larger than the sum of its proper divisors (16017829).

82201691 is a wasteful number, since it uses less digits than its factorization.

82201691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9826.

The product of its (nonzero) digits is 1728, while the sum is 29.

The square root of 82201691 is about 9066.5148210324. The cubic root of 82201691 is about 434.8040532027.

The spelling of 82201691 in words is "eighty-two million, two hundred one thousand, six hundred ninety-one".