40101091 has 2 divisors, whose sum is σ = 40101092. Its totient is φ = 40101090.

The previous prime is 40101071. The next prime is 40101109. The reversal of 40101091 is 19010104.

It is a happy number.

Together with next prime (40101109) 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 40101091 - 2⁵ = 40101059 is a prime.

It is not a weakly prime, because it can be changed into another prime (40101031) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20050545 + 20050546.

It is an arithmetic number, because the mean of its divisors is an integer number (20050546).

Almost surely, 2^40101091 is an apocalyptic number.

40101091 is a deficient number, since it is larger than the sum of its proper divisors (1).

40101091 is an equidigital number, since it uses as much as digits as its factorization.

40101091 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 36, while the sum is 16.

The square root of 40101091 is about 6332.5422225201. The cubic root of 40101091 is about 342.2830522658.

Adding to 40101091 its reverse (19010104), we get a palindrome (59111195).

The spelling of 40101091 in words is "forty million, one hundred one thousand, ninety-one".