421556631 has 16 divisors (see below), whose sum is σ = 583787520. Its totient is φ = 270293760.

The previous prime is 421556621. The next prime is 421556657. The reversal of 421556631 is 136655124.

It is not a de Polignac number, because 421556631 - 2¹⁵ = 421523863 is a prime.

It is a super-2 number, since 2×421556631² = 355419986280140322, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 421556592 and 421556601.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (421556621) 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 15 ways as a sum of consecutive naturals, for example, 1255 + ... + 29063.

It is an arithmetic number, because the mean of its divisors is an integer number (36486720).

Almost surely, 2^421556631 is an apocalyptic number.

421556631 is a deficient number, since it is larger than the sum of its proper divisors (162230889).

421556631 is a wasteful number, since it uses less digits than its factorization.

421556631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28006.

The product of its digits is 21600, while the sum is 33.

The square root of 421556631 is about 20531.8443155991. The cubic root of 421556631 is about 749.8112894106.

The spelling of 421556631 in words is "four hundred twenty-one million, five hundred fifty-six thousand, six hundred thirty-one".