101011091 has 2 divisors, whose sum is σ = 101011092. Its totient is φ = 101011090.

The previous prime is 101011069. The next prime is 101011109. The reversal of 101011091 is 190110101.

It is a happy number.

Together with next prime (101011109) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 101011091 - 2²⁶ = 33902227 is a prime.

It is not a weakly prime, because it can be changed into another prime (101011291) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50505545 + 50505546.

It is an arithmetic number, because the mean of its divisors is an integer number (50505546).

Almost surely, 2^101011091 is an apocalyptic number.

101011091 is a deficient number, since it is larger than the sum of its proper divisors (1).

101011091 is an equidigital number, since it uses as much as digits as its factorization.

101011091 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9, while the sum is 14.

The square root of 101011091 is about 10050.4274038471. The cubic root of 101011091 is about 465.7179966556.

Adding to 101011091 its reverse (190110101), we get a palindrome (291121192).

It can be divided in two parts, 10 and 1011091, that added together give a palindrome (1011101).

The spelling of 101011091 in words is "one hundred one million, eleven thousand, ninety-one".