40699561 has 4 divisors (see below), whose sum is σ = 46513792. Its totient is φ = 34885332.

The previous prime is 40699541. The next prime is 40699567. The reversal of 40699561 is 16599604.

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 40699561 - 2²⁵ = 7145129 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40699567) 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, 2907105 + ... + 2907118.

It is an arithmetic number, because the mean of its divisors is an integer number (11628448).

Almost surely, 2^40699561 is an apocalyptic number.

It is an amenable number.

40699561 is a deficient number, since it is larger than the sum of its proper divisors (5814231).

40699561 is an equidigital number, since it uses as much as digits as its factorization.

40699561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5814230.

The product of its (nonzero) digits is 58320, while the sum is 40.

The square root of 40699561 is about 6379.6207567535. The cubic root of 40699561 is about 343.9773990244.

The spelling of 40699561 in words is "forty million, six hundred ninety-nine thousand, five hundred sixty-one".