861418949 has 4 divisors (see below), whose sum is σ = 861536160. Its totient is φ = 861301740.

The previous prime is 861418847. The next prime is 861418963. The reversal of 861418949 is 949814168.

861418949 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 861418949 - 2¹⁶ = 861353413 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 861418897 and 861418906.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (861418249) 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, 46787 + ... + 62544.

It is an arithmetic number, because the mean of its divisors is an integer number (215384040).

Almost surely, 2^861418949 is an apocalyptic number.

It is an amenable number.

861418949 is a deficient number, since it is larger than the sum of its proper divisors (117211).

861418949 is a wasteful number, since it uses less digits than its factorization.

861418949 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 117210.

The product of its digits is 497664, while the sum is 50.

The square root of 861418949 is about 29349.9395059002. The cubic root of 861418949 is about 951.4912678214.

The spelling of 861418949 in words is "eight hundred sixty-one million, four hundred eighteen thousand, nine hundred forty-nine".