2159097865 has 8 divisors (see below), whose sum is σ = 2593365768. Its totient is φ = 1725646080.

The previous prime is 2159097793. The next prime is 2159097931. The reversal of 2159097865 is 5687909512.

It can be written as a sum of positive squares in 4 ways, for example, as 808094329 + 1351003536 = 28427^2 + 36756^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 2159097865 - 2¹⁹ = 2158573577 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 198192 + ... + 208801.

It is an arithmetic number, because the mean of its divisors is an integer number (324170721).

Almost surely, 2^2159097865 is an apocalyptic number.

It is an amenable number.

2159097865 is a deficient number, since it is larger than the sum of its proper divisors (434267903).

2159097865 is a wasteful number, since it uses less digits than its factorization.

2159097865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 408059.

The product of its (nonzero) digits is 1360800, while the sum is 52.

The square root of 2159097865 is about 46466.0937135886. The cubic root of 2159097865 is about 1292.4808268353.

The spelling of 2159097865 in words is "two billion, one hundred fifty-nine million, ninety-seven thousand, eight hundred sixty-five".