1491166439 has 4 divisors (see below), whose sum is σ = 1704190224. Its totient is φ = 1278142656.

The previous prime is 1491166409. The next prime is 1491166451. The reversal of 1491166439 is 9346611941.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 1491166439 - 2²⁴ = 1474389223 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1491166439.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1491166409) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 106511882 + ... + 106511895.

It is an arithmetic number, because the mean of its divisors is an integer number (426047556).

Almost surely, 2^1491166439 is an apocalyptic number.

1491166439 is a deficient number, since it is larger than the sum of its proper divisors (213023785).

1491166439 is an equidigital number, since it uses as much as digits as its factorization.

1491166439 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 213023784.

The product of its digits is 139968, while the sum is 44.

The square root of 1491166439 is about 38615.6242860322. The cubic root of 1491166439 is about 1142.4627274221.

The spelling of 1491166439 in words is "one billion, four hundred ninety-one million, one hundred sixty-six thousand, four hundred thirty-nine".