102831989 has 4 divisors (see below), whose sum is σ = 110742156. Its totient is φ = 94921824.

The previous prime is 102831979. The next prime is 102832013. The reversal of 102831989 is 989138201.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 69388900 + 33443089 = 8330^2 + 5783^2 .

It is a cyclic number.

It is not a de Polignac number, because 102831989 - 2⁸ = 102831733 is a prime.

It is a super-2 number, since 2×102831989² = 21148835923392242, 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 (102831959) 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, 3955064 + ... + 3955089.

It is an arithmetic number, because the mean of its divisors is an integer number (27685539).

Almost surely, 2^102831989 is an apocalyptic number.

It is an amenable number.

102831989 is a deficient number, since it is larger than the sum of its proper divisors (7910167).

102831989 is an equidigital number, since it uses as much as digits as its factorization.

102831989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7910166.

The product of its (nonzero) digits is 31104, while the sum is 41.

The square root of 102831989 is about 10140.6108790349. The cubic root of 102831989 is about 468.4998023847.

The spelling of 102831989 in words is "one hundred two million, eight hundred thirty-one thousand, nine hundred eighty-nine".