432021781 has 2 divisors, whose sum is σ = 432021782. Its totient is φ = 432021780.

The previous prime is 432021773. The next prime is 432021803. The reversal of 432021781 is 187120234.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 250715556 + 181306225 = 15834^2 + 13465^2 .

It is a cyclic number.

It is not a de Polignac number, because 432021781 - 2³ = 432021773 is a prime.

It is a super-2 number, since 2×432021781² = 373285638516823922, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (432021481) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 216010890 + 216010891.

It is an arithmetic number, because the mean of its divisors is an integer number (216010891).

Almost surely, 2^432021781 is an apocalyptic number.

It is an amenable number.

432021781 is a deficient number, since it is larger than the sum of its proper divisors (1).

432021781 is an equidigital number, since it uses as much as digits as its factorization.

432021781 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2688, while the sum is 28.

The square root of 432021781 is about 20785.1336536477. The cubic root of 432021781 is about 755.9653345106.

The spelling of 432021781 in words is "four hundred thirty-two million, twenty-one thousand, seven hundred eighty-one".