1131643247 has 4 divisors (see below), whose sum is σ = 1293306576. Its totient is φ = 969979920.

The previous prime is 1131643241. The next prime is 1131643259. The reversal of 1131643247 is 7423461311.

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

It is not a de Polignac number, because 1131643247 - 2⁴ = 1131643231 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 (1131643241) 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, 80831654 + ... + 80831667.

It is an arithmetic number, because the mean of its divisors is an integer number (323326644).

Almost surely, 2^1131643247 is an apocalyptic number.

1131643247 is a deficient number, since it is larger than the sum of its proper divisors (161663329).

1131643247 is an equidigital number, since it uses as much as digits as its factorization.

1131643247 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 161663328.

The product of its digits is 12096, while the sum is 32.

The square root of 1131643247 is about 33639.9055735892. The cubic root of 1131643247 is about 1042.0850818319.

The spelling of 1131643247 in words is "one billion, one hundred thirty-one million, six hundred forty-three thousand, two hundred forty-seven".