431085866 has 4 divisors (see below), whose sum is σ = 646628802. Its totient is φ = 215542932.

The previous prime is 431085821. The next prime is 431085869. The reversal of 431085866 is 668580134.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 668580134 = 2 ⋅334290067.

It can be written as a sum of positive squares in only one way, i.e., 399400225 + 31685641 = 19985^2 + 5629^2 .

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (431085869) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 107771465 + ... + 107771468.

Almost surely, 2^431085866 is an apocalyptic number.

431085866 is a deficient number, since it is larger than the sum of its proper divisors (215542936).

431085866 is a wasteful number, since it uses less digits than its factorization.

431085866 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 215542935.

The product of its (nonzero) digits is 138240, while the sum is 41.

The square root of 431085866 is about 20762.6073988794. The cubic root of 431085866 is about 755.4190419725.

The spelling of 431085866 in words is "four hundred thirty-one million, eighty-five thousand, eight hundred sixty-six".