431272909 has 4 divisors (see below), whose sum is σ = 431314780. Its totient is φ = 431231040.

The previous prime is 431272883. The next prime is 431272927. The reversal of 431272909 is 909272134.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 305900100 + 125372809 = 17490^2 + 11197^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-431272909 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (431272939) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6499 + ... + 30079.

It is an arithmetic number, because the mean of its divisors is an integer number (107828695).

Almost surely, 2^431272909 is an apocalyptic number.

It is an amenable number.

431272909 is a deficient number, since it is larger than the sum of its proper divisors (41871).

431272909 is a wasteful number, since it uses less digits than its factorization.

431272909 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41870.

The product of its (nonzero) digits is 27216, while the sum is 37.

The square root of 431272909 is about 20767.1112338717. Note that the first 3 decimals coincide. The cubic root of 431272909 is about 755.5282819363.

The spelling of 431272909 in words is "four hundred thirty-one million, two hundred seventy-two thousand, nine hundred nine".