421291587 has 4 divisors (see below), whose sum is σ = 561722120. Its totient is φ = 280861056.

The previous prime is 421291543. The next prime is 421291589. The reversal of 421291587 is 785192124.

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

It is not a de Polignac number, because 421291587 - 2¹⁴ = 421275203 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (421291589) 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, 70215262 + ... + 70215267.

It is an arithmetic number, because the mean of its divisors is an integer number (140430530).

Almost surely, 2^421291587 is an apocalyptic number.

421291587 is a deficient number, since it is larger than the sum of its proper divisors (140430533).

421291587 is a wasteful number, since it uses less digits than its factorization.

421291587 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 140430532.

The product of its digits is 40320, while the sum is 39.

The square root of 421291587 is about 20525.3888391913. The cubic root of 421291587 is about 749.6541142864.

The spelling of 421291587 in words is "four hundred twenty-one million, two hundred ninety-one thousand, five hundred eighty-seven".