861513394 has 12 divisors (see below), whose sum is σ = 1503253134. Its totient is φ = 369219984.

The previous prime is 861513379. The next prime is 861513397. The reversal of 861513394 is 493315168.

It can be written as a sum of positive squares in only one way, i.e., 789891025 + 71622369 = 28105^2 + 8463^2 .

It is not an unprimeable number, because it can be changed into a prime (861513397) 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, 4395379 + ... + 4395574.

Almost surely, 2^861513394 is an apocalyptic number.

861513394 is a deficient number, since it is larger than the sum of its proper divisors (641739740).

861513394 is a wasteful number, since it uses less digits than its factorization.

861513394 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8790969 (or 8790962 counting only the distinct ones).

The product of its digits is 77760, while the sum is 40.

The square root of 861513394 is about 29351.5484089000. The cubic root of 861513394 is about 951.5260400264.

The spelling of 861513394 in words is "eight hundred sixty-one million, five hundred thirteen thousand, three hundred ninety-four".