726552121 has 2 divisors, whose sum is σ = 726552122. Its totient is φ = 726552120.

The previous prime is 726552097. The next prime is 726552131. The reversal of 726552121 is 121255627.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 682515625 + 44036496 = 26125^2 + 6636^2 .

It is an emirp because it is prime and its reverse (121255627) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 726552121 - 2²⁵ = 692997689 is a prime.

It is not a weakly prime, because it can be changed into another prime (726552131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 363276060 + 363276061.

It is an arithmetic number, because the mean of its divisors is an integer number (363276061).

Almost surely, 2^726552121 is an apocalyptic number.

It is an amenable number.

726552121 is a deficient number, since it is larger than the sum of its proper divisors (1).

726552121 is an equidigital number, since it uses as much as digits as its factorization.

726552121 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8400, while the sum is 31.

The square root of 726552121 is about 26954.6307895323. The cubic root of 726552121 is about 898.9915127572.

The spelling of 726552121 in words is "seven hundred twenty-six million, five hundred fifty-two thousand, one hundred twenty-one".