126191321 has 2 divisors, whose sum is σ = 126191322. Its totient is φ = 126191320.

The previous prime is 126191309. The next prime is 126191327. The reversal of 126191321 is 123191621.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 82101721 + 44089600 = 9061^2 + 6640^2 .

It is a cyclic number.

It is not a de Polignac number, because 126191321 - 2⁶ = 126191257 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (126191327) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 63095660 + 63095661.

It is an arithmetic number, because the mean of its divisors is an integer number (63095661).

Almost surely, 2^126191321 is an apocalyptic number.

It is an amenable number.

126191321 is a deficient number, since it is larger than the sum of its proper divisors (1).

126191321 is an equidigital number, since it uses as much as digits as its factorization.

126191321 is an evil number, because the sum of its binary digits is even.

The product of its digits is 648, while the sum is 26.

The square root of 126191321 is about 11233.4910424142. The cubic root of 126191321 is about 501.5834083428.

The spelling of 126191321 in words is "one hundred twenty-six million, one hundred ninety-one thousand, three hundred twenty-one".