421869193 has 2 divisors, whose sum is σ = 421869194. Its totient is φ = 421869192.

The previous prime is 421869181. The next prime is 421869209. The reversal of 421869193 is 391968124.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 376670464 + 45198729 = 19408^2 + 6723^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-421869193 is a prime.

It is not a weakly prime, because it can be changed into another prime (421869113) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210934596 + 210934597.

It is an arithmetic number, because the mean of its divisors is an integer number (210934597).

Almost surely, 2^421869193 is an apocalyptic number.

It is an amenable number.

421869193 is a deficient number, since it is larger than the sum of its proper divisors (1).

421869193 is an equidigital number, since it uses as much as digits as its factorization.

421869193 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 93312, while the sum is 43.

The square root of 421869193 is about 20539.4545448510. The cubic root of 421869193 is about 749.9965587990.

The spelling of 421869193 in words is "four hundred twenty-one million, eight hundred sixty-nine thousand, one hundred ninety-three".