861397741 has 4 divisors (see below), whose sum is σ = 882407484. Its totient is φ = 840388000.

The previous prime is 861397729. The next prime is 861397753. The reversal of 861397741 is 147793168.

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

It is an interprime number because it is at equal distance from previous prime (861397729) and next prime (861397753).

It can be written as a sum of positive squares in 2 ways, for example, as 196840900 + 664556841 = 14030^2 + 25779^2 .

It is a cyclic number.

It is not a de Polignac number, because 861397741 - 2⁵ = 861397709 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 861397691 and 861397700.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (861397721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10504810 + ... + 10504891.

It is an arithmetic number, because the mean of its divisors is an integer number (220601871).

Almost surely, 2^861397741 is an apocalyptic number.

It is an amenable number.

861397741 is a deficient number, since it is larger than the sum of its proper divisors (21009743).

861397741 is a wasteful number, since it uses less digits than its factorization.

861397741 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21009742.

The product of its digits is 254016, while the sum is 46.

The square root of 861397741 is about 29349.5782082128. The cubic root of 861397741 is about 951.4834592352.

The spelling of 861397741 in words is "eight hundred sixty-one million, three hundred ninety-seven thousand, seven hundred forty-one".