42451807 has 2 divisors, whose sum is σ = 42451808. Its totient is φ = 42451806.

The previous prime is 42451789. The next prime is 42451817. The reversal of 42451807 is 70815424.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 42451807 - 2¹⁹ = 41927519 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42451817) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21225903 + 21225904.

It is an arithmetic number, because the mean of its divisors is an integer number (21225904).

Almost surely, 2^42451807 is an apocalyptic number.

42451807 is a deficient number, since it is larger than the sum of its proper divisors (1).

42451807 is an equidigital number, since it uses as much as digits as its factorization.

42451807 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8960, while the sum is 31.

The square root of 42451807 is about 6515.5051223984. The cubic root of 42451807 is about 348.8446447734.

The spelling of 42451807 in words is "forty-two million, four hundred fifty-one thousand, eight hundred seven".