1131491854 has 12 divisors (see below), whose sum is σ = 1774240776. Its totient is φ = 541147772.

The previous prime is 1131491843. The next prime is 1131491861. The reversal of 1131491854 is 4581941311.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 533674 + ... + 535789.

It is an arithmetic number, because the mean of its divisors is an integer number (147853398).

Almost surely, 2^1131491854 is an apocalyptic number.

1131491854 is a deficient number, since it is larger than the sum of its proper divisors (642748922).

1131491854 is a wasteful number, since it uses less digits than its factorization.

1131491854 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1069511 (or 1069488 counting only the distinct ones).

The product of its digits is 17280, while the sum is 37.

The square root of 1131491854 is about 33637.6552987868. The cubic root of 1131491854 is about 1042.0386091699.

The spelling of 1131491854 in words is "one billion, one hundred thirty-one million, four hundred ninety-one thousand, eight hundred fifty-four".