861611290 has 32 divisors (see below), whose sum is σ = 1584267264. Its totient is φ = 337296960.

The previous prime is 861611273. The next prime is 861611291. The reversal of 861611290 is 92116168.

861611290 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (861611291) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 101095 + ... + 109285.

It is an arithmetic number, because the mean of its divisors is an integer number (49508352).

Almost surely, 2^861611290 is an apocalyptic number.

861611290 is a deficient number, since it is larger than the sum of its proper divisors (722655974).

861611290 is a wasteful number, since it uses less digits than its factorization.

861611290 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8422.

The product of its (nonzero) digits is 5184, while the sum is 34.

The square root of 861611290 is about 29353.2160077904. The cubic root of 861611290 is about 951.5620801181.

The spelling of 861611290 in words is "eight hundred sixty-one million, six hundred eleven thousand, two hundred ninety".