102031989 has 4 divisors (see below), whose sum is σ = 136042656. Its totient is φ = 68021324.

The previous prime is 102031987. The next prime is 102031997. The reversal of 102031989 is 989130201.

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 102031989 - 2¹ = 102031987 is a prime.

It is a super-2 number, since 2×102031989² = 20821053558592242, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (102031981) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17005329 + ... + 17005334.

It is an arithmetic number, because the mean of its divisors is an integer number (34010664).

Almost surely, 2^102031989 is an apocalyptic number.

It is an amenable number.

102031989 is a deficient number, since it is larger than the sum of its proper divisors (34010667).

102031989 is an equidigital number, since it uses as much as digits as its factorization.

102031989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34010666.

The product of its (nonzero) digits is 3888, while the sum is 33.

The square root of 102031989 is about 10101.0885057008. The cubic root of 102031989 is about 467.2817118884.

The spelling of 102031989 in words is "one hundred two million, thirty-one thousand, nine hundred eighty-nine".