940399561 has 2 divisors, whose sum is σ = 940399562. Its totient is φ = 940399560.

The previous prime is 940399541. The next prime is 940399573. The reversal of 940399561 is 165993049.

940399561 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 719312400 + 221087161 = 26820^2 + 14869^2 .

It is a cyclic number.

It is not a de Polignac number, because 940399561 - 2⁵ = 940399529 is a prime.

It is not a weakly prime, because it can be changed into another prime (940399531) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 470199780 + 470199781.

It is an arithmetic number, because the mean of its divisors is an integer number (470199781).

Almost surely, 2^940399561 is an apocalyptic number.

It is an amenable number.

940399561 is a deficient number, since it is larger than the sum of its proper divisors (1).

940399561 is an equidigital number, since it uses as much as digits as its factorization.

940399561 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 262440, while the sum is 46.

The square root of 940399561 is about 30665.9348626452. The cubic root of 940399561 is about 979.7248849428.

The spelling of 940399561 in words is "nine hundred forty million, three hundred ninety-nine thousand, five hundred sixty-one".