1131591897 has 16 divisors (see below), whose sum is σ = 1677574080. Its totient is φ = 753880896.

The previous prime is 1131591889. The next prime is 1131591941. The reversal of 1131591897 is 7981951311.

It is a happy number.

1131591897 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 1131591897 - 2³ = 1131591889 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1131592897) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 28438 + ... + 55424.

It is an arithmetic number, because the mean of its divisors is an integer number (104848380).

Almost surely, 2^1131591897 is an apocalyptic number.

It is an amenable number.

1131591897 is a deficient number, since it is larger than the sum of its proper divisors (545982183).

1131591897 is a wasteful number, since it uses less digits than its factorization.

1131591897 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28549 (or 28543 counting only the distinct ones).

The product of its digits is 68040, while the sum is 45.

The square root of 1131591897 is about 33639.1423344889. The cubic root of 1131591897 is about 1042.0693195386.

The spelling of 1131591897 in words is "one billion, one hundred thirty-one million, five hundred ninety-one thousand, eight hundred ninety-seven".