1989000031 has 2 divisors, whose sum is σ = 1989000032. Its totient is φ = 1989000030.

The previous prime is 1989000029. The next prime is 1989000103. The reversal of 1989000031 is 1300009891.

Together with next prime (1989000103) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is an emirp because it is prime and its reverse (1300009891) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1989000031 - 2¹ = 1989000029 is a prime.

It is a super-2 number, since 2×1989000031² = 7912242246636001922, which contains 22 as substring.

Together with 1989000029, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 1988999957 and 1989000002.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1989000001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 994500015 + 994500016.

It is an arithmetic number, because the mean of its divisors is an integer number (994500016).

Almost surely, 2^1989000031 is an apocalyptic number.

1989000031 is a deficient number, since it is larger than the sum of its proper divisors (1).

1989000031 is an equidigital number, since it uses as much as digits as its factorization.

1989000031 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1944, while the sum is 31.

The square root of 1989000031 is about 44598.2065895031. The cubic root of 1989000031 is about 1257.6069534486.

The spelling of 1989000031 in words is "one billion, nine hundred eighty-nine million, thirty-one", and thus it is an aban number.