126921593 has 2 divisors, whose sum is σ = 126921594. Its totient is φ = 126921592.

The previous prime is 126921589. The next prime is 126921607. The reversal of 126921593 is 395129621.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 121594729 + 5326864 = 11027^2 + 2308^2 .

It is an emirp because it is prime and its reverse (395129621) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 126921593 - 2² = 126921589 is a prime.

It is a super-2 number, since 2×126921593² = 32218181539315298, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (126921563) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 63460796 + 63460797.

It is an arithmetic number, because the mean of its divisors is an integer number (63460797).

Almost surely, 2^126921593 is an apocalyptic number.

It is an amenable number.

126921593 is a deficient number, since it is larger than the sum of its proper divisors (1).

126921593 is an equidigital number, since it uses as much as digits as its factorization.

126921593 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 29160, while the sum is 38.

The square root of 126921593 is about 11265.9483844016. The cubic root of 126921593 is about 502.5491060316.

The spelling of 126921593 in words is "one hundred twenty-six million, nine hundred twenty-one thousand, five hundred ninety-three".