861337588091 has 16 divisors (see below), whose sum is σ = 871084870656. Its totient is φ = 851641330176.

The previous prime is 861337588081. The next prime is 861337588117. The reversal of 861337588091 is 190885733168.

861337588091 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 861337588091 - 2¹⁰ = 861337587067 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 861337588091.

It is not an unprimeable number, because it can be changed into a prime (861337588021) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 49730765 + ... + 49748081.

It is an arithmetic number, because the mean of its divisors is an integer number (54442804416).

Almost surely, 2^861337588091 is an apocalyptic number.

861337588091 is a deficient number, since it is larger than the sum of its proper divisors (9747282565).

861337588091 is a wasteful number, since it uses less digits than its factorization.

861337588091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18758.

The product of its (nonzero) digits is 8709120, while the sum is 59.

The spelling of 861337588091 in words is "eight hundred sixty-one billion, three hundred thirty-seven million, five hundred eighty-eight thousand, ninety-one".