1118978997 has 8 divisors (see below), whose sum is σ = 1505175744. Its totient is φ = 739384128.

The previous prime is 1118978977. The next prime is 1118979019. The reversal of 1118978997 is 7998798111.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1118978997 - 2¹⁶ = 1118913461 is a prime.

It is a super-2 number, since 2×1118978997² = 2504227991454252018, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1118978997.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1118978977) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1650073 + ... + 1650750.

It is an arithmetic number, because the mean of its divisors is an integer number (188146968).

Almost surely, 2^1118978997 is an apocalyptic number.

It is an amenable number.

1118978997 is a deficient number, since it is larger than the sum of its proper divisors (386196747).

1118978997 is a wasteful number, since it uses less digits than its factorization.

1118978997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3300939.

The product of its digits is 2286144, while the sum is 60.

The square root of 1118978997 is about 33451.1434333716. The cubic root of 1118978997 is about 1038.1831558551.

The spelling of 1118978997 in words is "one billion, one hundred eighteen million, nine hundred seventy-eight thousand, nine hundred ninety-seven".