1491000439 has 2 divisors, whose sum is σ = 1491000440. Its totient is φ = 1491000438.

The previous prime is 1491000391. The next prime is 1491000443. The reversal of 1491000439 is 9340001941.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1491000439 - 2⁹ = 1490999927 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1491000439.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1491000739) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 745500219 + 745500220.

It is an arithmetic number, because the mean of its divisors is an integer number (745500220).

Almost surely, 2^1491000439 is an apocalyptic number.

1491000439 is a deficient number, since it is larger than the sum of its proper divisors (1).

1491000439 is an equidigital number, since it uses as much as digits as its factorization.

1491000439 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3888, while the sum is 31.

The square root of 1491000439 is about 38613.4748371601. The cubic root of 1491000439 is about 1142.4203320092.

The spelling of 1491000439 in words is "one billion, four hundred ninety-one million, four hundred thirty-nine", and thus it is an aban number.