1131947311 has 8 divisors (see below), whose sum is σ = 1264970448. Its totient is φ = 1003944000.

The previous prime is 1131947309. The next prime is 1131947321. The reversal of 1131947311 is 1137491311.

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 1131947311 - 2¹ = 1131947309 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 (1131947321) 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, 1254480 + ... + 1255381.

It is an arithmetic number, because the mean of its divisors is an integer number (158121306).

Almost surely, 2^1131947311 is an apocalyptic number.

1131947311 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1131947311 is a deficient number, since it is larger than the sum of its proper divisors (133023137).

1131947311 is a wasteful number, since it uses less digits than its factorization.

1131947311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2509913.

The product of its digits is 2268, while the sum is 31.

The square root of 1131947311 is about 33644.4246644225. The cubic root of 1131947311 is about 1042.1784069395.

The spelling of 1131947311 in words is "one billion, one hundred thirty-one million, nine hundred forty-seven thousand, three hundred eleven".