1128508491 has 8 divisors (see below), whose sum is σ = 1641466944. Its totient is φ = 683944520.

The previous prime is 1128508471. The next prime is 1128508529. The reversal of 1128508491 is 1948058211.

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

It is a cyclic number.

It is not a de Polignac number, because 1128508491 - 2⁹ = 1128507979 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1128508471) 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, 17098581 + ... + 17098646.

It is an arithmetic number, because the mean of its divisors is an integer number (205183368).

Almost surely, 2^1128508491 is an apocalyptic number.

1128508491 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1128508491 is a deficient number, since it is larger than the sum of its proper divisors (512958453).

1128508491 is a wasteful number, since it uses less digits than its factorization.

1128508491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34197241.

The product of its (nonzero) digits is 23040, while the sum is 39.

The square root of 1128508491 is about 33593.2804441603. The cubic root of 1128508491 is about 1041.1219681006.

The spelling of 1128508491 in words is "one billion, one hundred twenty-eight million, five hundred eight thousand, four hundred ninety-one".