82861187 has 2 divisors, whose sum is σ = 82861188. Its totient is φ = 82861186.

The previous prime is 82861159. The next prime is 82861217. The reversal of 82861187 is 78116828.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-82861187 is a prime.

It is a super-2 number, since 2×82861187² = 13731952622097938, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (82861127) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41430593 + 41430594.

It is an arithmetic number, because the mean of its divisors is an integer number (41430594).

Almost surely, 2^82861187 is an apocalyptic number.

82861187 is a deficient number, since it is larger than the sum of its proper divisors (1).

82861187 is an equidigital number, since it uses as much as digits as its factorization.

82861187 is an evil number, because the sum of its binary digits is even.

The product of its digits is 43008, while the sum is 41.

The square root of 82861187 is about 9102.8120380463. The cubic root of 82861187 is about 435.9637538956.

The spelling of 82861187 in words is "eighty-two million, eight hundred sixty-one thousand, one hundred eighty-seven".