867989961 has 24 divisors (see below), whose sum is σ = 1340426880. Its totient is φ = 539323776.

The previous prime is 867989953. The next prime is 867989963. The reversal of 867989961 is 169989768.

It is not a de Polignac number, because 867989961 - 2³ = 867989953 is a prime.

It is not an unprimeable number, because it can be changed into a prime (867989963) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 11781 + ... + 43298.

It is an arithmetic number, because the mean of its divisors is an integer number (55851120).

Almost surely, 2^867989961 is an apocalyptic number.

It is an amenable number.

867989961 is a deficient number, since it is larger than the sum of its proper divisors (472436919).

867989961 is a wasteful number, since it uses less digits than its factorization.

867989961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55205 (or 55202 counting only the distinct ones).

The product of its digits is 11757312, while the sum is 63.

The square root of 867989961 is about 29461.6693518884. The cubic root of 867989961 is about 953.9045070088.

The spelling of 867989961 in words is "eight hundred sixty-seven million, nine hundred eighty-nine thousand, nine hundred sixty-one".