40556161 has 4 divisors (see below), whose sum is σ = 40828500. Its totient is φ = 40283824.

The previous prime is 40556119. The next prime is 40556177. The reversal of 40556161 is 16165504.

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

It can be written as a sum of positive squares in 2 ways, for example, as 21902400 + 18653761 = 4680^2 + 4319^2 .

It is a cyclic number.

It is not a de Polignac number, because 40556161 - 2²¹ = 38459009 is a prime.

It is a Duffinian 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, 135946 + ... + 136243.

It is an arithmetic number, because the mean of its divisors is an integer number (10207125).

Almost surely, 2^40556161 is an apocalyptic number.

It is an amenable number.

40556161 is a deficient number, since it is larger than the sum of its proper divisors (272339).

40556161 is a wasteful number, since it uses less digits than its factorization.

40556161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 272338.

The product of its (nonzero) digits is 3600, while the sum is 28.

The square root of 40556161 is about 6368.3719269528. The cubic root of 40556161 is about 343.5729359844.

The spelling of 40556161 in words is "forty million, five hundred fifty-six thousand, one hundred sixty-one".