1118249491 has 4 divisors (see below), whose sum is σ = 1139348592. Its totient is φ = 1097150392.

The previous prime is 1118249471. The next prime is 1118249501. The reversal of 1118249491 is 1949428111.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1118249491 is a prime.

It is a super-3 number, since 3×1118249491³ (a number of 28 digits) contains 333 as substring.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1118249471) 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, 10549471 + ... + 10549576.

It is an arithmetic number, because the mean of its divisors is an integer number (284837148).

Almost surely, 2^1118249491 is an apocalyptic number.

1118249491 is a deficient number, since it is larger than the sum of its proper divisors (21099101).

1118249491 is an equidigital number, since it uses as much as digits as its factorization.

1118249491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21099100.

The product of its digits is 20736, while the sum is 40.

The square root of 1118249491 is about 33440.2376038209. The cubic root of 1118249491 is about 1037.9574961280.

The spelling of 1118249491 in words is "one billion, one hundred eighteen million, two hundred forty-nine thousand, four hundred ninety-one".