40556191 has 4 divisors (see below), whose sum is σ = 43675912. Its totient is φ = 37436472.

The previous prime is 40556189. The next prime is 40556227. The reversal of 40556191 is 19165504.

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 40556191 - 2¹ = 40556189 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 (40556111) 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, 1559841 + ... + 1559866.

It is an arithmetic number, because the mean of its divisors is an integer number (10918978).

Almost surely, 2^40556191 is an apocalyptic number.

40556191 is a deficient number, since it is larger than the sum of its proper divisors (3119721).

40556191 is a wasteful number, since it uses less digits than its factorization.

40556191 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3119720.

The product of its (nonzero) digits is 5400, while the sum is 31.

The square root of 40556191 is about 6368.3742823424. The cubic root of 40556191 is about 343.5730206997.

The spelling of 40556191 in words is "forty million, five hundred fifty-six thousand, one hundred ninety-one".