126791689 has 2 divisors, whose sum is σ = 126791690. Its totient is φ = 126791688.

The previous prime is 126791681. The next prime is 126791701. The reversal of 126791689 is 986197621.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 123387664 + 3404025 = 11108^2 + 1845^2 .

It is an emirp because it is prime and its reverse (986197621) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 126791689 - 2³ = 126791681 is a prime.

It is a super-2 number, since 2×126791689² = 32152264798945442, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (126791681) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 63395844 + 63395845.

It is an arithmetic number, because the mean of its divisors is an integer number (63395845).

Almost surely, 2^126791689 is an apocalyptic number.

It is an amenable number.

126791689 is a deficient number, since it is larger than the sum of its proper divisors (1).

126791689 is an equidigital number, since it uses as much as digits as its factorization.

126791689 is an evil number, because the sum of its binary digits is even.

The product of its digits is 326592, while the sum is 49.

The square root of 126791689 is about 11260.1815704721. The cubic root of 126791689 is about 502.3775948317.

The spelling of 126791689 in words is "one hundred twenty-six million, seven hundred ninety-one thousand, six hundred eighty-nine".