1131031091 has 2 divisors, whose sum is σ = 1131031092. Its totient is φ = 1131031090.

The previous prime is 1131031067. The next prime is 1131031103. The reversal of 1131031091 is 1901301311.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1131031091 - 2¹⁴ = 1131014707 is a prime.

It is not a weakly prime, because it can be changed into another prime (1131031051) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 565515545 + 565515546.

It is an arithmetic number, because the mean of its divisors is an integer number (565515546).

Almost surely, 2^1131031091 is an apocalyptic number.

1131031091 is a deficient number, since it is larger than the sum of its proper divisors (1).

1131031091 is an equidigital number, since it uses as much as digits as its factorization.

1131031091 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 81, while the sum is 20.

The square root of 1131031091 is about 33630.8056846695. The cubic root of 1131031091 is about 1041.8971446006.

The spelling of 1131031091 in words is "one billion, one hundred thirty-one million, thirty-one thousand, ninety-one".