126891619 has 4 divisors (see below), whose sum is σ = 126939096. Its totient is φ = 126844144.

The previous prime is 126891607. The next prime is 126891623. The reversal of 126891619 is 916198621.

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

It is a cyclic number.

It is not a de Polignac number, because 126891619 - 2¹¹ = 126889571 is a prime.

It is a super-2 number, since 2×126891619² = 32202965944882322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (126891629) 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, 19474 + ... + 25159.

It is an arithmetic number, because the mean of its divisors is an integer number (31734774).

Almost surely, 2^126891619 is an apocalyptic number.

126891619 is a deficient number, since it is larger than the sum of its proper divisors (47477).

126891619 is an equidigital number, since it uses as much as digits as its factorization.

126891619 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47476.

The product of its digits is 46656, while the sum is 43.

The square root of 126891619 is about 11264.6180139408. The cubic root of 126891619 is about 502.5095419919.

The spelling of 126891619 in words is "one hundred twenty-six million, eight hundred ninety-one thousand, six hundred nineteen".