126736321 has 2 divisors, whose sum is σ = 126736322. Its totient is φ = 126736320.

The previous prime is 126736261. The next prime is 126736333. The reversal of 126736321 is 123637621.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 65286400 + 61449921 = 8080^2 + 7839^2 .

It is an emirp because it is prime and its reverse (123637621) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 126736321 - 2⁷ = 126736193 is a prime.

It is not a weakly prime, because it can be changed into another prime (126736361) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 63368160 + 63368161.

It is an arithmetic number, because the mean of its divisors is an integer number (63368161).

Almost surely, 2^126736321 is an apocalyptic number.

It is an amenable number.

126736321 is a deficient number, since it is larger than the sum of its proper divisors (1).

126736321 is an equidigital number, since it uses as much as digits as its factorization.

126736321 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9072, while the sum is 31.

The square root of 126736321 is about 11257.7227270883. The cubic root of 126736321 is about 502.3044573026.

The spelling of 126736321 in words is "one hundred twenty-six million, seven hundred thirty-six thousand, three hundred twenty-one".