40991099 has 2 divisors, whose sum is σ = 40991100. Its totient is φ = 40991098.

The previous prime is 40991087. The next prime is 40991107. The reversal of 40991099 is 99019904.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 40991099 - 2⁸ = 40990843 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (40991009) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20495549 + 20495550.

It is an arithmetic number, because the mean of its divisors is an integer number (20495550).

Almost surely, 2^40991099 is an apocalyptic number.

40991099 is a deficient number, since it is larger than the sum of its proper divisors (1).

40991099 is an equidigital number, since it uses as much as digits as its factorization.

40991099 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 26244, while the sum is 41.

The square root of 40991099 is about 6402.4291483780. The cubic root of 40991099 is about 344.7967689139.

The spelling of 40991099 in words is "forty million, nine hundred ninety-one thousand, ninety-nine".