40512561 has 4 divisors (see below), whose sum is σ = 54016752. Its totient is φ = 27008372.

The previous prime is 40512559. The next prime is 40512587. The reversal of 40512561 is 16521504.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 40512561 - 2¹ = 40512559 is a prime.

It is not an unprimeable number, because it can be changed into a prime (40514561) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6752091 + ... + 6752096.

It is an arithmetic number, because the mean of its divisors is an integer number (13504188).

Almost surely, 2^40512561 is an apocalyptic number.

It is an amenable number.

40512561 is a deficient number, since it is larger than the sum of its proper divisors (13504191).

40512561 is a wasteful number, since it uses less digits than its factorization.

40512561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13504190.

The product of its (nonzero) digits is 1200, while the sum is 24.

The square root of 40512561 is about 6364.9478395349. The cubic root of 40512561 is about 343.4497721965.

The spelling of 40512561 in words is "forty million, five hundred twelve thousand, five hundred sixty-one".