421504631 has 4 divisors (see below), whose sum is σ = 421789200. Its totient is φ = 421220064.

The previous prime is 421504621. The next prime is 421504679. The reversal of 421504631 is 136405124.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-421504631 is a prime.

It is a super-2 number, since 2×421504631² = 355332307908892322, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 421504631.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (421504621) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 140051 + ... + 143028.

It is an arithmetic number, because the mean of its divisors is an integer number (105447300).

Almost surely, 2^421504631 is an apocalyptic number.

421504631 is a deficient number, since it is larger than the sum of its proper divisors (284569).

421504631 is a wasteful number, since it uses less digits than its factorization.

421504631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 284568.

The product of its (nonzero) digits is 2880, while the sum is 26.

The square root of 421504631 is about 20530.5779509492. The cubic root of 421504631 is about 749.7804578153.

Adding to 421504631 its reverse (136405124), we get a palindrome (557909755).

The spelling of 421504631 in words is "four hundred twenty-one million, five hundred four thousand, six hundred thirty-one".