421531471 has 4 divisors (see below), whose sum is σ = 425261952. Its totient is φ = 417800992.

The previous prime is 421531457. The next prime is 421531483. The reversal of 421531471 is 174135124.

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

It is a cyclic number.

It is not a de Polignac number, because 421531471 - 2¹⁵ = 421498703 is a prime.

It is a super-3 number, since 3×421531471³ (a number of 27 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (421531171) 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, 1865071 + ... + 1865296.

It is an arithmetic number, because the mean of its divisors is an integer number (106315488).

Almost surely, 2^421531471 is an apocalyptic number.

421531471 is a deficient number, since it is larger than the sum of its proper divisors (3730481).

421531471 is a wasteful number, since it uses less digits than its factorization.

421531471 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3730480.

The product of its digits is 3360, while the sum is 28.

The square root of 421531471 is about 20531.2315996873. The cubic root of 421531471 is about 749.7963719784.

Adding to 421531471 its reverse (174135124), we get a palindrome (595666595).

The spelling of 421531471 in words is "four hundred twenty-one million, five hundred thirty-one thousand, four hundred seventy-one".