40292561 has 4 divisors (see below), whose sum is σ = 41052852. Its totient is φ = 39532272.

The previous prime is 40292557. The next prime is 40292611. The reversal of 40292561 is 16529204.

It is a happy number.

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 30250000 + 10042561 = 5500^2 + 3169^2 .

It is a cyclic number.

It is not a de Polignac number, because 40292561 - 2² = 40292557 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40292501) 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, 380066 + ... + 380171.

It is an arithmetic number, because the mean of its divisors is an integer number (10263213).

Almost surely, 2^40292561 is an apocalyptic number.

It is an amenable number.

40292561 is a deficient number, since it is larger than the sum of its proper divisors (760291).

40292561 is an equidigital number, since it uses as much as digits as its factorization.

40292561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 760290.

The product of its (nonzero) digits is 4320, while the sum is 29.

The square root of 40292561 is about 6347.6421606767. The cubic root of 40292561 is about 342.8269518968.

The spelling of 40292561 in words is "forty million, two hundred ninety-two thousand, five hundred sixty-one".