40090171391 has 4 divisors (see below), whose sum is σ = 40090793592. Its totient is φ = 40089549192.

The previous prime is 40090171351. The next prime is 40090171403. The reversal of 40090171391 is 19317109004.

It is a happy number.

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 40090171391 - 2⁶ = 40090171327 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40090171351) 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, 201605 + ... + 347598.

It is an arithmetic number, because the mean of its divisors is an integer number (10022698398).

Almost surely, 2^40090171391 is an apocalyptic number.

40090171391 is a deficient number, since it is larger than the sum of its proper divisors (622201).

40090171391 is an equidigital number, since it uses as much as digits as its factorization.

40090171391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 622200.

The product of its (nonzero) digits is 6804, while the sum is 35.

The spelling of 40090171391 in words is "forty billion, ninety million, one hundred seventy-one thousand, three hundred ninety-one".