861919045 has 16 divisors (see below), whose sum is σ = 1114525440. Its totient is φ = 636116544.

The previous prime is 861919031. The next prime is 861919049. The reversal of 861919045 is 540919168.

It is a cyclic number.

It is not a de Polignac number, because 861919045 - 2¹³ = 861910853 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 861918992 and 861919010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (861919049) 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 15 ways as a sum of consecutive naturals, for example, 156346 + ... + 161764.

It is an arithmetic number, because the mean of its divisors is an integer number (69657840).

Almost surely, 2^861919045 is an apocalyptic number.

It is an amenable number.

861919045 is a deficient number, since it is larger than the sum of its proper divisors (252606395).

861919045 is a wasteful number, since it uses less digits than its factorization.

861919045 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7884.

The product of its (nonzero) digits is 77760, while the sum is 43.

The square root of 861919045 is about 29358.4578103142. The cubic root of 861919045 is about 951.6753613356.

The spelling of 861919045 in words is "eight hundred sixty-one million, nine hundred nineteen thousand, forty-five".