861832729831 has 4 divisors (see below), whose sum is σ = 889633785664. Its totient is φ = 834031674000.

The previous prime is 861832729829. The next prime is 861832729841. The reversal of 861832729831 is 138927238168.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 861832729831 - 2¹ = 861832729829 is a prime.

It is a super-2 number, since 2×861832729831² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (861832729841) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13900527870 + ... + 13900527931.

It is an arithmetic number, because the mean of its divisors is an integer number (222408446416).

Almost surely, 2^861832729831 is an apocalyptic number.

861832729831 is a deficient number, since it is larger than the sum of its proper divisors (27801055833).

861832729831 is a wasteful number, since it uses less digits than its factorization.

861832729831 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27801055832.

The product of its digits is 6967296, while the sum is 58.

The spelling of 861832729831 in words is "eight hundred sixty-one billion, eight hundred thirty-two million, seven hundred twenty-nine thousand, eight hundred thirty-one".