1012111091 has 2 divisors, whose sum is σ = 1012111092. Its totient is φ = 1012111090.

The previous prime is 1012111043. The next prime is 1012111123. The reversal of 1012111091 is 1901112101.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1012111091 - 2¹⁰ = 1012110067 is a prime.

It is not a weakly prime, because it can be changed into another prime (1012111291) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 506055545 + 506055546.

It is an arithmetic number, because the mean of its divisors is an integer number (506055546).

Almost surely, 2^1012111091 is an apocalyptic number.

1012111091 is a deficient number, since it is larger than the sum of its proper divisors (1).

1012111091 is an equidigital number, since it uses as much as digits as its factorization.

1012111091 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 18, while the sum is 17.

The square root of 1012111091 is about 31813.6934510912. The cubic root of 1012111091 is about 1004.0208414984.

Adding to 1012111091 its reverse (1901112101), we get a palindrome (2913223192).

It can be divided in two parts, 10121 and 11091, that added together give a palindrome (21212).

The spelling of 1012111091 in words is "one billion, twelve million, one hundred eleven thousand, ninety-one".