40520191 has 4 divisors (see below), whose sum is σ = 40669984. Its totient is φ = 40370400.

The previous prime is 40520167. The next prime is 40520213. The reversal of 40520191 is 19102504.

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 40520191 - 2⁵ = 40520159 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 (40520111) 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, 74490 + ... + 75031.

It is an arithmetic number, because the mean of its divisors is an integer number (10167496).

Almost surely, 2^40520191 is an apocalyptic number.

40520191 is a deficient number, since it is larger than the sum of its proper divisors (149793).

40520191 is a wasteful number, since it uses less digits than its factorization.

40520191 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 149792.

The product of its (nonzero) digits is 360, while the sum is 22.

The square root of 40520191 is about 6365.5471877915. The cubic root of 40520191 is about 343.4713322361.

Adding to 40520191 its reverse (19102504), we get a palindrome (59622695).

The spelling of 40520191 in words is "forty million, five hundred twenty thousand, one hundred ninety-one".