426831187 has 2 divisors, whose sum is σ = 426831188. Its totient is φ = 426831186.

The previous prime is 426831169. The next prime is 426831199. The reversal of 426831187 is 781138624.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 426831187 - 2⁷ = 426831059 is a prime.

It is not a weakly prime, because it can be changed into another prime (426832187) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 213415593 + 213415594.

It is an arithmetic number, because the mean of its divisors is an integer number (213415594).

Almost surely, 2^426831187 is an apocalyptic number.

426831187 is a deficient number, since it is larger than the sum of its proper divisors (1).

426831187 is an equidigital number, since it uses as much as digits as its factorization.

426831187 is an evil number, because the sum of its binary digits is even.

The product of its digits is 64512, while the sum is 40.

The square root of 426831187 is about 20659.8931991431. The cubic root of 426831187 is about 752.9255728962.

The spelling of 426831187 in words is "four hundred twenty-six million, eight hundred thirty-one thousand, one hundred eighty-seven".