450431781 has 16 divisors (see below), whose sum is σ = 615935040. Its totient is φ = 292625280.

The previous prime is 450431771. The next prime is 450431809. The reversal of 450431781 is 187134054.

It is not a de Polignac number, because 450431781 - 2⁶ = 450431717 is a prime.

It is a super-2 number, since 2×450431781² = 405777578669663922, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (450431771) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 147690 + ... + 150708.

It is an arithmetic number, because the mean of its divisors is an integer number (38495940).

Almost surely, 2^450431781 is an apocalyptic number.

450431781 is a gapful number since it is divisible by the number (41) formed by its first and last digit.

It is an amenable number.

450431781 is a deficient number, since it is larger than the sum of its proper divisors (165503259).

450431781 is a wasteful number, since it uses less digits than its factorization.

450431781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4276.

The product of its (nonzero) digits is 13440, while the sum is 33.

The square root of 450431781 is about 21223.3781712526. The cubic root of 450431781 is about 766.5544487507.

The spelling of 450431781 in words is "four hundred fifty million, four hundred thirty-one thousand, seven hundred eighty-one".