1011891131 has 2 divisors, whose sum is σ = 1011891132. Its totient is φ = 1011891130.

The previous prime is 1011891103. The next prime is 1011891143. The reversal of 1011891131 is 1311981101.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1011891131 - 2¹⁰ = 1011890107 is a prime.

It is a super-2 number, since 2×1011891131² = 2047847321992918322, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1011891131.

It is not a weakly prime, because it can be changed into another prime (1011891191) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 505945565 + 505945566.

It is an arithmetic number, because the mean of its divisors is an integer number (505945566).

Almost surely, 2^1011891131 is an apocalyptic number.

1011891131 is a deficient number, since it is larger than the sum of its proper divisors (1).

1011891131 is an equidigital number, since it uses as much as digits as its factorization.

1011891131 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 216, while the sum is 26.

The square root of 1011891131 is about 31810.2362613043. The cubic root of 1011891131 is about 1003.9481023078.

The spelling of 1011891131 in words is "one billion, eleven million, eight hundred ninety-one thousand, one hundred thirty-one".