861134381 has 6 divisors (see below), whose sum is σ = 891853482. Its totient is φ = 831439280.

The previous prime is 861134369. The next prime is 861134389. The reversal of 861134381 is 183431168.

It can be written as a sum of positive squares in 3 ways, for example, as 885481 + 860248900 = 941^2 + 29330^2 .

It is not a de Polignac number, because 861134381 - 2¹⁴ = 861117997 is a prime.

It is a super-2 number, since 2×861134381² = 1483104844280506322, which 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 (861134389) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 511130 + ... + 512811.

It is an arithmetic number, because the mean of its divisors is an integer number (148642247).

Almost surely, 2^861134381 is an apocalyptic number.

It is an amenable number.

861134381 is a deficient number, since it is larger than the sum of its proper divisors (30719101).

861134381 is a wasteful number, since it uses less digits than its factorization.

861134381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1023999 (or 1023970 counting only the distinct ones).

The product of its digits is 13824, while the sum is 35.

The square root of 861134381 is about 29345.0912590164. The cubic root of 861134381 is about 951.3864818794.

The spelling of 861134381 in words is "eight hundred sixty-one million, one hundred thirty-four thousand, three hundred eighty-one".