421751489 has 4 divisors (see below), whose sum is σ = 421804500. Its totient is φ = 421698480.

The previous prime is 421751471. The next prime is 421751507. The reversal of 421751489 is 984157124.

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

It is an interprime number because it is at equal distance from previous prime (421751471) and next prime (421751507).

It can be written as a sum of positive squares in 2 ways, for example, as 138839089 + 282912400 = 11783^2 + 16820^2 .

It is a cyclic number.

It is not a de Polignac number, because 421751489 - 2⁸ = 421751233 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (421751389) 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, 11882 + ... + 31379.

It is an arithmetic number, because the mean of its divisors is an integer number (105451125).

Almost surely, 2^421751489 is an apocalyptic number.

It is an amenable number.

421751489 is a deficient number, since it is larger than the sum of its proper divisors (53011).

421751489 is an equidigital number, since it uses as much as digits as its factorization.

421751489 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53010.

The product of its digits is 80640, while the sum is 41.

The square root of 421751489 is about 20536.5890303137. The cubic root of 421751489 is about 749.9268011524.

The spelling of 421751489 in words is "four hundred twenty-one million, seven hundred fifty-one thousand, four hundred eighty-nine".