42866251 has 2 divisors, whose sum is σ = 42866252. Its totient is φ = 42866250.

The previous prime is 42866221. The next prime is 42866287. The reversal of 42866251 is 15266824.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 42866251 - 2¹⁷ = 42735179 is a prime.

It is not a weakly prime, because it can be changed into another prime (42866221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21433125 + 21433126.

It is an arithmetic number, because the mean of its divisors is an integer number (21433126).

Almost surely, 2^42866251 is an apocalyptic number.

42866251 is a deficient number, since it is larger than the sum of its proper divisors (1).

42866251 is an equidigital number, since it uses as much as digits as its factorization.

42866251 is an evil number, because the sum of its binary digits is even.

The product of its digits is 23040, while the sum is 34.

The square root of 42866251 is about 6547.2323160248. The cubic root of 42866251 is about 349.9761915778.

The spelling of 42866251 in words is "forty-two million, eight hundred sixty-six thousand, two hundred fifty-one".