866250491 has 2 divisors, whose sum is σ = 866250492. Its totient is φ = 866250490.

The previous prime is 866250461. The next prime is 866250547. The reversal of 866250491 is 194052668.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-866250491 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (866250461) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 433125245 + 433125246.

It is an arithmetic number, because the mean of its divisors is an integer number (433125246).

Almost surely, 2^866250491 is an apocalyptic number.

866250491 is a deficient number, since it is larger than the sum of its proper divisors (1).

866250491 is an equidigital number, since it uses as much as digits as its factorization.

866250491 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 103680, while the sum is 41.

The square root of 866250491 is about 29432.1336467474. The cubic root of 866250491 is about 953.2668660225.

The spelling of 866250491 in words is "eight hundred sixty-six million, two hundred fifty thousand, four hundred ninety-one".