126889289 has 4 divisors (see below), whose sum is σ = 128197524. Its totient is φ = 125581056.

The previous prime is 126889271. The next prime is 126889307. The reversal of 126889289 is 982988621.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 982988621 = 5897 ⋅166693.

It is an interprime number because it is at equal distance from previous prime (126889271) and next prime (126889307).

It can be written as a sum of positive squares in 2 ways, for example, as 96727225 + 30162064 = 9835^2 + 5492^2 .

It is a cyclic number.

It is not a de Polignac number, because 126889289 - 2⁸ = 126889033 is a prime.

It is a super-2 number, since 2×126889289² = 32201783325851042, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 126889289.

It is not an unprimeable number, because it can be changed into a prime (126889489) 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, 653972 + ... + 654165.

It is an arithmetic number, because the mean of its divisors is an integer number (32049381).

Almost surely, 2^126889289 is an apocalyptic number.

It is an amenable number.

126889289 is a deficient number, since it is larger than the sum of its proper divisors (1308235).

126889289 is an equidigital number, since it uses as much as digits as its factorization.

126889289 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1308234.

The product of its digits is 995328, while the sum is 53.

The square root of 126889289 is about 11264.5145922938. The cubic root of 126889289 is about 502.5064662584.

The spelling of 126889289 in words is "one hundred twenty-six million, eight hundred eighty-nine thousand, two hundred eighty-nine".