860900055409 has 3 divisors (see below), whose sum is σ = 860900983257. Its totient is φ = 860899127562.

The previous prime is 860900055371. The next prime is 860900055413. The reversal of 860900055409 is 904550009068.

The square root of 860900055409 is 927847.

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

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is not a de Polignac number, because 860900055409 - 2¹¹ = 860900053361 is a prime.

It is a super-2 number, since 2×860900055409² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (860900056409) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 463924 + ... + 1391770.

It is an arithmetic number, because the mean of its divisors is an integer number (286966994419).

Almost surely, 2^860900055409 is an apocalyptic number.

860900055409 is the 927847-th square number.

860900055409 is the 463924-th centered octagonal number.

It is an amenable number.

860900055409 is a deficient number, since it is larger than the sum of its proper divisors (927848).

860900055409 is an frugal number, since it uses more digits than its factorization.

860900055409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1855694 (or 927847 counting only the distinct ones).

The product of its (nonzero) digits is 388800, while the sum is 46.

The spelling of 860900055409 in words is "eight hundred sixty billion, nine hundred million, fifty-five thousand, four hundred nine".