1131997 has 2 divisors, whose sum is σ = 1131998. Its totient is φ = 1131996.

The previous prime is 1131973. The next prime is 1132003. The reversal of 1131997 is 7991311.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1038361 + 93636 = 1019^2 + 306^2 .

It is an emirp because it is prime and its reverse (7991311) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1131997 - 2⁷ = 1131869 is a prime.

It is a plaindrome in base 16.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1131917) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 565998 + 565999.

It is an arithmetic number, because the mean of its divisors is an integer number (565999).

2^1131997 is an apocalyptic number.

It is an amenable number.

1131997 is a deficient number, since it is larger than the sum of its proper divisors (1).

1131997 is an equidigital number, since it uses as much as digits as its factorization.

1131997 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1701, while the sum is 31.

The square root of 1131997 is about 1063.9534764265. The cubic root of 1131997 is about 104.2193656190.

The spelling of 1131997 in words is "one million, one hundred thirty-one thousand, nine hundred ninety-seven".