1131398285 has 4 divisors (see below), whose sum is σ = 1357677948. Its totient is φ = 905118624.

The previous prime is 1131398269. The next prime is 1131398287. The reversal of 1131398285 is 5828931311.

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

It can be written as a sum of positive squares in 2 ways, for example, as 478646884 + 652751401 = 21878^2 + 25549^2 .

It is a cyclic number.

It is not a de Polignac number, because 1131398285 - 2⁴ = 1131398269 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1131398287) 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, 113139824 + ... + 113139833.

It is an arithmetic number, because the mean of its divisors is an integer number (339419487).

Almost surely, 2^1131398285 is an apocalyptic number.

It is an amenable number.

1131398285 is a deficient number, since it is larger than the sum of its proper divisors (226279663).

1131398285 is an equidigital number, since it uses as much as digits as its factorization.

1131398285 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 226279662.

The product of its digits is 51840, while the sum is 41.

The square root of 1131398285 is about 33636.2644329004. The cubic root of 1131398285 is about 1042.0098844975.

The spelling of 1131398285 in words is "one billion, one hundred thirty-one million, three hundred ninety-eight thousand, two hundred eighty-five".