2865567961 has 9 divisors (see below), whose sum is σ = 2890786431. Its totient is φ = 2840568984.

The previous prime is 2865567959. The next prime is 2865567979. The reversal of 2865567961 is 1697655682.

The square root of 2865567961 is 53531.

It is a perfect power (a square), and thus also a powerful number.

2865567961 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 188540361 + 2677027600 = 13731^2 + 51740^2 .

It is not a de Polignac number, because 2865567961 - 2¹ = 2865567959 is a prime.

It is a super-2 number, since 2×2865567961² = 16422959478219395042, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2865567931) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 10652535 + ... + 10652803.

Almost surely, 2^2865567961 is an apocalyptic number.

2865567961 is the 53531-st square number.

2865567961 is the 26766-th centered octagonal number.

It is an amenable number.

2865567961 is a deficient number, since it is larger than the sum of its proper divisors (25218470).

2865567961 is an frugal number, since it uses more digits than its factorization.

2865567961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 936 (or 468 counting only the distinct ones).

The product of its digits is 5443200, while the sum is 55.

The cubic root of 2865567961 is about 1420.3768029012.

The spelling of 2865567961 in words is "two billion, eight hundred sixty-five million, five hundred sixty-seven thousand, nine hundred sixty-one".