40611561 has 16 divisors (see below), whose sum is σ = 55071744. Its totient is φ = 26617104.

The previous prime is 40611559. The next prime is 40611587. The reversal of 40611561 is 16511604.

It is not a de Polignac number, because 40611561 - 2¹ = 40611559 is a prime.

It is not an unprimeable number, because it can be changed into a prime (40611511) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 51210 + ... + 51996.

It is an arithmetic number, because the mean of its divisors is an integer number (3441984).

Almost surely, 2^40611561 is an apocalyptic number.

It is an amenable number.

40611561 is a deficient number, since it is larger than the sum of its proper divisors (14460183).

40611561 is a wasteful number, since it uses less digits than its factorization.

40611561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1060.

The product of its (nonzero) digits is 720, while the sum is 24.

The square root of 40611561 is about 6372.7200628931. The cubic root of 40611561 is about 343.7293058176.

The spelling of 40611561 in words is "forty million, six hundred eleven thousand, five hundred sixty-one".