1491434866 has 4 divisors (see below), whose sum is σ = 2237152302. Its totient is φ = 745717432.

The previous prime is 1491434827. The next prime is 1491434873. The reversal of 1491434866 is 6684341941.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 6684341941 = 131 ⋅51025511.

It can be written as a sum of positive squares in only one way, i.e., 1344322225 + 147112641 = 36665^2 + 12129^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 372858715 + ... + 372858718.

Almost surely, 2^1491434866 is an apocalyptic number.

1491434866 is a deficient number, since it is larger than the sum of its proper divisors (745717436).

1491434866 is an equidigital number, since it uses as much as digits as its factorization.

1491434866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 745717435.

The product of its digits is 497664, while the sum is 46.

The square root of 1491434866 is about 38619.0997564677. The cubic root of 1491434866 is about 1142.5312754248.

The spelling of 1491434866 in words is "one billion, four hundred ninety-one million, four hundred thirty-four thousand, eight hundred sixty-six".