421567731 has 24 divisors (see below), whose sum is σ = 656903520. Its totient is φ = 258978816.

The previous prime is 421567711. The next prime is 421567747. The reversal of 421567731 is 137765124.

It is a happy number.

421567731 is a `hidden beast` number, since 4 + 21 + 567 + 73 + 1 = 666.

It is not a de Polignac number, because 421567731 - 2⁹ = 421567219 is a prime.

It is a super-2 number, since 2×421567731² = 355438703640976722, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (421567711) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 72915 + ... + 78483.

It is an arithmetic number, because the mean of its divisors is an integer number (27370980).

Almost surely, 2^421567731 is an apocalyptic number.

421567731 is a deficient number, since it is larger than the sum of its proper divisors (235335789).

421567731 is a wasteful number, since it uses less digits than its factorization.

421567731 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6235 (or 6232 counting only the distinct ones).

The product of its digits is 35280, while the sum is 36.

The square root of 421567731 is about 20532.1146256298. The cubic root of 421567731 is about 749.8178704420.

The spelling of 421567731 in words is "four hundred twenty-one million, five hundred sixty-seven thousand, seven hundred thirty-one".