1491964239 has 4 divisors (see below), whose sum is σ = 1989285656. Its totient is φ = 994642824.

The previous prime is 1491964231. The next prime is 1491964261. The reversal of 1491964239 is 9324691941.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9324691941 = 3 ⋅3108230647.

It is not a de Polignac number, because 1491964239 - 2³ = 1491964231 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 (1491964231) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 248660704 + ... + 248660709.

It is an arithmetic number, because the mean of its divisors is an integer number (497321414).

Almost surely, 2^1491964239 is an apocalyptic number.

1491964239 is a deficient number, since it is larger than the sum of its proper divisors (497321417).

1491964239 is an equidigital number, since it uses as much as digits as its factorization.

1491964239 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 497321416.

The product of its digits is 419904, while the sum is 48.

The square root of 1491964239 is about 38625.9529202841. The cubic root of 1491964239 is about 1142.6664369120. Note that the first 3 decimals are identical.

The spelling of 1491964239 in words is "one billion, four hundred ninety-one million, nine hundred sixty-four thousand, two hundred thirty-nine".