431504021 has 8 divisors (see below), whose sum is σ = 480721080. Its totient is φ = 384576192.

The previous prime is 431504009. The next prime is 431504033. The reversal of 431504021 is 120405134.

It is an interprime number because it is at equal distance from previous prime (431504009) and next prime (431504033).

It can be written as a sum of positive squares in 4 ways, for example, as 110019121 + 321484900 = 10489^2 + 17930^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 431504021 - 2⁶ = 431503957 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 431503984 and 431504002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (431504071) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 571910 + ... + 572663.

It is an arithmetic number, because the mean of its divisors is an integer number (60090135).

Almost surely, 2^431504021 is an apocalyptic number.

It is an amenable number.

431504021 is a deficient number, since it is larger than the sum of its proper divisors (49217059).

431504021 is a wasteful number, since it uses less digits than its factorization.

431504021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1144615.

The product of its (nonzero) digits is 480, while the sum is 20.

The square root of 431504021 is about 20772.6748638686. The cubic root of 431504021 is about 755.6632161952.

Adding to 431504021 its reverse (120405134), we get a palindrome (551909155).

The spelling of 431504021 in words is "four hundred thirty-one million, five hundred four thousand, twenty-one".