1118639497 has 12 divisors (see below), whose sum is σ = 1186713840. Its totient is φ = 1051509600.

The previous prime is 1118639413. The next prime is 1118639503. The reversal of 1118639497 is 7949368111.

It is a de Polignac number, because none of the positive numbers 2^k-1118639497 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 1118639497.

It is not an unprimeable number, because it can be changed into a prime (1118639407) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1860997 + ... + 1861597.

It is an arithmetic number, because the mean of its divisors is an integer number (98892820).

Almost surely, 2^1118639497 is an apocalyptic number.

It is an amenable number.

1118639497 is a deficient number, since it is larger than the sum of its proper divisors (68074343).

1118639497 is an frugal number, since it uses more digits than its factorization.

1118639497 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1384 (or 783 counting only the distinct ones).

The product of its digits is 326592, while the sum is 49.

The square root of 1118639497 is about 33446.0684834556. The cubic root of 1118639497 is about 1038.0781497634.

The spelling of 1118639497 in words is "one billion, one hundred eighteen million, six hundred thirty-nine thousand, four hundred ninety-seven".