126651289 has 4 divisors (see below), whose sum is σ = 127219456. Its totient is φ = 126083124.

The previous prime is 126651281. The next prime is 126651293. The reversal of 126651289 is 982156621.

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, and also an emirpimes, since its reverse is a distinct semiprime: 982156621 = 53 ⋅18531257.

It is a cyclic number.

It is not a de Polignac number, because 126651289 - 2³ = 126651281 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (126651281) 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, 283749 + ... + 284194.

It is an arithmetic number, because the mean of its divisors is an integer number (31804864).

Almost surely, 2^126651289 is an apocalyptic number.

It is an amenable number.

126651289 is a deficient number, since it is larger than the sum of its proper divisors (568167).

126651289 is an equidigital number, since it uses as much as digits as its factorization.

126651289 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 568166.

The product of its digits is 51840, while the sum is 40.

The square root of 126651289 is about 11253.9454859174. The cubic root of 126651289 is about 502.1920940690.

The spelling of 126651289 in words is "one hundred twenty-six million, six hundred fifty-one thousand, two hundred eighty-nine".