861097436 has 6 divisors (see below), whose sum is σ = 1506920520. Its totient is φ = 430548716.

The previous prime is 861097427. The next prime is 861097439. The reversal of 861097436 is 634790168.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (861097439) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 107637176 + ... + 107637183.

It is an arithmetic number, because the mean of its divisors is an integer number (251153420).

Almost surely, 2^861097436 is an apocalyptic number.

It is an amenable number.

861097436 is a deficient number, since it is larger than the sum of its proper divisors (645823084).

861097436 is a wasteful number, since it uses less digits than its factorization.

861097436 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 215274363 (or 215274361 counting only the distinct ones).

The product of its (nonzero) digits is 217728, while the sum is 44.

The square root of 861097436 is about 29344.4617602709. The cubic root of 861097436 is about 951.3728759982.

The spelling of 861097436 in words is "eight hundred sixty-one million, ninety-seven thousand, four hundred thirty-six".