861231970 has 16 divisors (see below), whose sum is σ = 1551695040. Its totient is φ = 344164464.

The previous prime is 861231947. The next prime is 861231971. The reversal of 861231970 is 79132168.

It is not an unprimeable number, because it can be changed into a prime (861231971) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 29880 + ... + 51139.

It is an arithmetic number, because the mean of its divisors is an integer number (96980940).

Almost surely, 2^861231970 is an apocalyptic number.

861231970 is a deficient number, since it is larger than the sum of its proper divisors (690463070).

861231970 is a wasteful number, since it uses less digits than its factorization.

861231970 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 82089.

The product of its (nonzero) digits is 18144, while the sum is 37.

The square root of 861231970 is about 29346.7539942666. The cubic root of 861231970 is about 951.4224194947.

The spelling of 861231970 in words is "eight hundred sixty-one million, two hundred thirty-one thousand, nine hundred seventy".