866531051 has 2 divisors, whose sum is σ = 866531052. Its totient is φ = 866531050.

The previous prime is 866531011. The next prime is 866531059. The reversal of 866531051 is 150135668.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 866531051 - 2²⁶ = 799422187 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (866531059) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 433265525 + 433265526.

It is an arithmetic number, because the mean of its divisors is an integer number (433265526).

Almost surely, 2^866531051 is an apocalyptic number.

866531051 is a deficient number, since it is larger than the sum of its proper divisors (1).

866531051 is an equidigital number, since it uses as much as digits as its factorization.

866531051 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 21600, while the sum is 35.

The square root of 866531051 is about 29436.8994800743. The cubic root of 866531051 is about 953.3697691613.

The spelling of 866531051 in words is "eight hundred sixty-six million, five hundred thirty-one thousand, fifty-one".