861912113 has 2 divisors, whose sum is σ = 861912114. Its totient is φ = 861912112.

The previous prime is 861912013. The next prime is 861912119. The reversal of 861912113 is 311219168.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 776848384 + 85063729 = 27872^2 + 9223^2 .

It is a cyclic number.

It is not a de Polignac number, because 861912113 - 2¹⁶ = 861846577 is a prime.

It is a super-2 number, since 2×861912113² = 1485784981072249538, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 861912113.

It is not a weakly prime, because it can be changed into another prime (861912119) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 430956056 + 430956057.

It is an arithmetic number, because the mean of its divisors is an integer number (430956057).

Almost surely, 2^861912113 is an apocalyptic number.

It is an amenable number.

861912113 is a deficient number, since it is larger than the sum of its proper divisors (1).

861912113 is an equidigital number, since it uses as much as digits as its factorization.

861912113 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2592, while the sum is 32.

The square root of 861912113 is about 29358.3397521045. The cubic root of 861912113 is about 951.6728100398.

The spelling of 861912113 in words is "eight hundred sixty-one million, nine hundred twelve thousand, one hundred thirteen".