421031689 has 4 divisors (see below), whose sum is σ = 453418756. Its totient is φ = 388644624.

The previous prime is 421031671. The next prime is 421031711. The reversal of 421031689 is 986130124.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 68343289 + 352688400 = 8267^2 + 18780^2 .

It is a cyclic number.

It is not a de Polignac number, because 421031689 - 2⁷ = 421031561 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (421031609) 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 in 3 ways as a sum of consecutive naturals, for example, 16193514 + ... + 16193539.

It is an arithmetic number, because the mean of its divisors is an integer number (113354689).

Almost surely, 2^421031689 is an apocalyptic number.

It is an amenable number.

421031689 is a deficient number, since it is larger than the sum of its proper divisors (32387067).

421031689 is a wasteful number, since it uses less digits than its factorization.

421031689 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32387066.

The product of its (nonzero) digits is 10368, while the sum is 34.

The square root of 421031689 is about 20519.0567278323. The cubic root of 421031689 is about 749.4999267913.

The spelling of 421031689 in words is "four hundred twenty-one million, thirty-one thousand, six hundred eighty-nine".