39564961 has 4 divisors (see below), whose sum is σ = 40929300. Its totient is φ = 38200624.

The previous prime is 39564923. The next prime is 39564983. The reversal of 39564961 is 16946593.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 16946593 = 61 ⋅277813.

It can be written as a sum of positive squares in 2 ways, for example, as 15358561 + 24206400 = 3919^2 + 4920^2 .

It is a cyclic number.

It is not a de Polignac number, because 39564961 - 2⁹ = 39564449 is a prime.

It is a super-2 number, since 2×39564961² = 3130772277863042, which contains 22 as substring.

It is a pancake number, because a pancake can be divided into 39564961 parts by 8895 straight cuts.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (39564901) 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, 682126 + ... + 682183.

It is an arithmetic number, because the mean of its divisors is an integer number (10232325).

Almost surely, 2^39564961 is an apocalyptic number.

It is an amenable number.

39564961 is a deficient number, since it is larger than the sum of its proper divisors (1364339).

39564961 is a wasteful number, since it uses less digits than its factorization.

39564961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1364338.

The product of its digits is 174960, while the sum is 43.

The square root of 39564961 is about 6290.0684415990. The cubic root of 39564961 is about 340.7508234319.

It can be divided in two parts, 395 and 64961, that added together give a palindrome (65356).

The spelling of 39564961 in words is "thirty-nine million, five hundred sixty-four thousand, nine hundred sixty-one".