866190231 has 24 divisors (see below), whose sum is σ = 1284344880. Its totient is φ = 562204800.

The previous prime is 866190229. The next prime is 866190287. The reversal of 866190231 is 132091668.

866190231 is a `hidden beast` number, since 8 + 6 + 619 + 0 + 2 + 31 = 666.

It is not a de Polignac number, because 866190231 - 2¹ = 866190229 is a prime.

It is a super-2 number, since 2×866190231² = 1500571032559666722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (866190211) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 197460 + ... + 201798.

It is an arithmetic number, because the mean of its divisors is an integer number (53514370).

Almost surely, 2^866190231 is an apocalyptic number.

866190231 is a deficient number, since it is larger than the sum of its proper divisors (418154649).

866190231 is a wasteful number, since it uses less digits than its factorization.

866190231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4927 (or 4924 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 36.

The square root of 866190231 is about 29431.1099179083. The cubic root of 866190231 is about 953.2447611025.

The spelling of 866190231 in words is "eight hundred sixty-six million, one hundred ninety thousand, two hundred thirty-one".