40517561 has 8 divisors (see below), whose sum is σ = 47251200. Its totient is φ = 34729044.

The previous prime is 40517551. The next prime is 40517563. The reversal of 40517561 is 16571504.

It is not a de Polignac number, because 40517561 - 2⁶ = 40517497 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40517563) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 58721 + ... + 59406.

It is an arithmetic number, because the mean of its divisors is an integer number (5906400).

Almost surely, 2^40517561 is an apocalyptic number.

It is an amenable number.

40517561 is a deficient number, since it is larger than the sum of its proper divisors (6733639).

40517561 is an equidigital number, since it uses as much as digits as its factorization.

40517561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 118148 (or 118134 counting only the distinct ones).

The product of its (nonzero) digits is 4200, while the sum is 29.

The square root of 40517561 is about 6365.3406036127. The cubic root of 40517561 is about 343.4639009685.

The spelling of 40517561 in words is "forty million, five hundred seventeen thousand, five hundred sixty-one".