421191187 has 2 divisors, whose sum is σ = 421191188. Its totient is φ = 421191186.

The previous prime is 421191179. The next prime is 421191191. The reversal of 421191187 is 781191124.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 421191187 - 2³ = 421191179 is a prime.

It is not a weakly prime, because it can be changed into another prime (421191137) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210595593 + 210595594.

It is an arithmetic number, because the mean of its divisors is an integer number (210595594).

Almost surely, 2^421191187 is an apocalyptic number.

421191187 is a deficient number, since it is larger than the sum of its proper divisors (1).

421191187 is an equidigital number, since it uses as much as digits as its factorization.

421191187 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4032, while the sum is 34.

The square root of 421191187 is about 20522.9429419857. The cubic root of 421191187 is about 749.5945583437.

The spelling of 421191187 in words is "four hundred twenty-one million, one hundred ninety-one thousand, one hundred eighty-seven".