40451191 has 4 divisors (see below), whose sum is σ = 44128584. Its totient is φ = 36773800.

The previous prime is 40451189. The next prime is 40451219. The reversal of 40451191 is 19115404.

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 40451191 - 2¹ = 40451189 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 (40451291) 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, 1838680 + ... + 1838701.

It is an arithmetic number, because the mean of its divisors is an integer number (11032146).

Almost surely, 2^40451191 is an apocalyptic number.

40451191 is a deficient number, since it is larger than the sum of its proper divisors (3677393).

40451191 is a wasteful number, since it uses less digits than its factorization.

40451191 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3677392.

The product of its (nonzero) digits is 720, while the sum is 25.

The square root of 40451191 is about 6360.1250773865. The cubic root of 40451191 is about 343.2762608708.

Adding to 40451191 its reverse (19115404), we get a palindrome (59566595).

The spelling of 40451191 in words is "forty million, four hundred fifty-one thousand, one hundred ninety-one".