867156989 has 4 divisors (see below), whose sum is σ = 873776640. Its totient is φ = 860537340.

The previous prime is 867156973. The next prime is 867156991. The reversal of 867156989 is 989651768.

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 867156989 - 2⁴ = 867156973 is a prime.

It is a super-2 number, since 2×867156989² = 1503922487143092242, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (867156919) 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, 3309629 + ... + 3309890.

It is an arithmetic number, because the mean of its divisors is an integer number (218444160).

Almost surely, 2^867156989 is an apocalyptic number.

It is an amenable number.

867156989 is a deficient number, since it is larger than the sum of its proper divisors (6619651).

867156989 is a wasteful number, since it uses less digits than its factorization.

867156989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6619650.

The product of its digits is 6531840, while the sum is 59.

The square root of 867156989 is about 29447.5294209888. The cubic root of 867156989 is about 953.5992692029.

The spelling of 867156989 in words is "eight hundred sixty-seven million, one hundred fifty-six thousand, nine hundred eighty-nine".