1131099997 has 2 divisors, whose sum is σ = 1131099998. Its totient is φ = 1131099996.

The previous prime is 1131099989. The next prime is 1131100031. The reversal of 1131099997 is 7999901311.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 710275801 + 420824196 = 26651^2 + 20514^2 .

It is a cyclic number.

It is not a de Polignac number, because 1131099997 - 2³ = 1131099989 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1131099997.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1131099397) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 565549998 + 565549999.

It is an arithmetic number, because the mean of its divisors is an integer number (565549999).

Almost surely, 2^1131099997 is an apocalyptic number.

It is an amenable number.

1131099997 is a deficient number, since it is larger than the sum of its proper divisors (1).

1131099997 is an equidigital number, since it uses as much as digits as its factorization.

1131099997 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 137781, while the sum is 49.

The square root of 1131099997 is about 33631.8301167213. The cubic root of 1131099997 is about 1041.9183027301.

It can be divided in two parts, 1131099 and 997, that added together give a square (1132096 = 1064²).

The spelling of 1131099997 in words is "one billion, one hundred thirty-one million, ninety-nine thousand, nine hundred ninety-seven".