1131191478 has 12 divisors (see below), whose sum is σ = 2450914908. Its totient is φ = 377063820.

The previous prime is 1131191471. The next prime is 1131191527. The reversal of 1131191478 is 8741911311.

1131191478 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1131191471) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 31421968 + ... + 31422003.

It is an arithmetic number, because the mean of its divisors is an integer number (204242909).

Almost surely, 2^1131191478 is an apocalyptic number.

1131191478 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

1131191478 is an abundant number, since it is smaller than the sum of its proper divisors (1319723430).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1131191478 is a wasteful number, since it uses less digits than its factorization.

1131191478 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62843979 (or 62843976 counting only the distinct ones).

The product of its digits is 6048, while the sum is 36.

The square root of 1131191478 is about 33633.1901252320. The cubic root of 1131191478 is about 1041.9463913633.

The spelling of 1131191478 in words is "one billion, one hundred thirty-one million, one hundred ninety-one thousand, four hundred seventy-eight".