1639113494 has 4 divisors (see below), whose sum is σ = 2458670244. Its totient is φ = 819556746.

The previous prime is 1639113479. The next prime is 1639113521. The reversal of 1639113494 is 4943119361.

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

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 409778372 + ... + 409778375.

It is an arithmetic number, because the mean of its divisors is an integer number (614667561).

Almost surely, 2^1639113494 is an apocalyptic number.

1639113494 is a deficient number, since it is larger than the sum of its proper divisors (819556750).

1639113494 is an equidigital number, since it uses as much as digits as its factorization.

1639113494 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 819556749.

The product of its digits is 69984, while the sum is 41.

The square root of 1639113494 is about 40485.9666304264. The cubic root of 1639113494 is about 1179.0611832695.

The spelling of 1639113494 in words is "one billion, six hundred thirty-nine million, one hundred thirteen thousand, four hundred ninety-four".