1491355839 has 4 divisors (see below), whose sum is σ = 1988474456. Its totient is φ = 994237224.

The previous prime is 1491355819. The next prime is 1491355867. The reversal of 1491355839 is 9385531941.

1491355839 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 1491355839 - 2²⁵ = 1457801407 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 (1491355819) 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, 248559304 + ... + 248559309.

It is an arithmetic number, because the mean of its divisors is an integer number (497118614).

Almost surely, 2^1491355839 is an apocalyptic number.

1491355839 is a deficient number, since it is larger than the sum of its proper divisors (497118617).

1491355839 is an equidigital number, since it uses as much as digits as its factorization.

1491355839 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 497118616.

The product of its digits is 583200, while the sum is 48.

The square root of 1491355839 is about 38618.0765833826. The cubic root of 1491355839 is about 1142.5110952131.

The spelling of 1491355839 in words is "one billion, four hundred ninety-one million, three hundred fifty-five thousand, eight hundred thirty-nine".