1131022391 has 2 divisors, whose sum is σ = 1131022392. Its totient is φ = 1131022390.

The previous prime is 1131022379. The next prime is 1131022423. The reversal of 1131022391 is 1932201311.

It is a weak prime.

It is an emirp because it is prime and its reverse (1932201311) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1131022391 - 2¹⁴ = 1131006007 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1131022331) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 565511195 + 565511196.

It is an arithmetic number, because the mean of its divisors is an integer number (565511196).

Almost surely, 2^1131022391 is an apocalyptic number.

1131022391 is a deficient number, since it is larger than the sum of its proper divisors (1).

1131022391 is an equidigital number, since it uses as much as digits as its factorization.

1131022391 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 324, while the sum is 23.

The square root of 1131022391 is about 33630.6763387238. The cubic root of 1131022391 is about 1041.8944731361.

The spelling of 1131022391 in words is "one billion, one hundred thirty-one million, twenty-two thousand, three hundred ninety-one".