40506198091 has 4 divisors (see below), whose sum is σ = 41494154184. Its totient is φ = 39518242000.

The previous prime is 40506198071. The next prime is 40506198191. The reversal of 40506198091 is 19089160504.

40506198091 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 40506198091 - 2⁹ = 40506197579 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40506198071) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 493977985 + ... + 493978066.

It is an arithmetic number, because the mean of its divisors is an integer number (10373538546).

Almost surely, 2^40506198091 is an apocalyptic number.

40506198091 is a gapful number since it is divisible by the number (41) formed by its first and last digit.

40506198091 is a deficient number, since it is larger than the sum of its proper divisors (987956093).

40506198091 is an equidigital number, since it uses as much as digits as its factorization.

40506198091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 987956092.

The product of its (nonzero) digits is 77760, while the sum is 43.

The spelling of 40506198091 in words is "forty billion, five hundred six million, one hundred ninety-eight thousand, ninety-one".