1131887947 has 2 divisors, whose sum is σ = 1131887948. Its totient is φ = 1131887946.

The previous prime is 1131887927. The next prime is 1131887957. The reversal of 1131887947 is 7497881311.

It is a strong prime.

It is an emirp because it is prime and its reverse (7497881311) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1131887947 - 2⁷ = 1131887819 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1131887947.

It is not a weakly prime, because it can be changed into another prime (1131887927) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 565943973 + 565943974.

It is an arithmetic number, because the mean of its divisors is an integer number (565943974).

Almost surely, 2^1131887947 is an apocalyptic number.

1131887947 is a deficient number, since it is larger than the sum of its proper divisors (1).

1131887947 is an equidigital number, since it uses as much as digits as its factorization.

1131887947 is an evil number, because the sum of its binary digits is even.

The product of its digits is 338688, while the sum is 49.

The square root of 1131887947 is about 33643.5424264449. The cubic root of 1131887947 is about 1042.1601879052.

The spelling of 1131887947 in words is "one billion, one hundred thirty-one million, eight hundred eighty-seven thousand, nine hundred forty-seven".