42785251 has 2 divisors, whose sum is σ = 42785252. Its totient is φ = 42785250.

The previous prime is 42785191. The next prime is 42785269. The reversal of 42785251 is 15258724.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 42785251 - 2⁷ = 42785123 is a prime.

It is not a weakly prime, because it can be changed into another prime (42785291) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21392625 + 21392626.

It is an arithmetic number, because the mean of its divisors is an integer number (21392626).

Almost surely, 2^42785251 is an apocalyptic number.

42785251 is a deficient number, since it is larger than the sum of its proper divisors (1).

42785251 is an equidigital number, since it uses as much as digits as its factorization.

42785251 is an evil number, because the sum of its binary digits is even.

The product of its digits is 22400, while the sum is 34.

The square root of 42785251 is about 6541.0435711743. The cubic root of 42785251 is about 349.7556144329.

The spelling of 42785251 in words is "forty-two million, seven hundred eighty-five thousand, two hundred fifty-one".