863161989 has 8 divisors (see below), whose sum is σ = 1151026752. Its totient is φ = 575369280.

The previous prime is 863161987. The next prime is 863161993. The reversal of 863161989 is 989161368.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 863161989 - 2¹ = 863161987 is a prime.

It is a super-2 number, since 2×863161989² = 1490097238508872242, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (863161987) 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, 23824 + ... + 47894.

It is an arithmetic number, because the mean of its divisors is an integer number (143878344).

Almost surely, 2^863161989 is an apocalyptic number.

It is an amenable number.

863161989 is a deficient number, since it is larger than the sum of its proper divisors (287864763).

863161989 is a wasteful number, since it uses less digits than its factorization.

863161989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36027.

The product of its digits is 559872, while the sum is 51.

The square root of 863161989 is about 29379.6185986136. The cubic root of 863161989 is about 952.1326011215.

The spelling of 863161989 in words is "eight hundred sixty-three million, one hundred sixty-one thousand, nine hundred eighty-nine".