726121771 has 2 divisors, whose sum is σ = 726121772. Its totient is φ = 726121770.

The previous prime is 726121769. The next prime is 726121787. The reversal of 726121771 is 177121627.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 726121771 - 2¹ = 726121769 is a prime.

Together with 726121769, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (726121751) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 363060885 + 363060886.

It is an arithmetic number, because the mean of its divisors is an integer number (363060886).

Almost surely, 2^726121771 is an apocalyptic number.

726121771 is a deficient number, since it is larger than the sum of its proper divisors (1).

726121771 is an equidigital number, since it uses as much as digits as its factorization.

726121771 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8232, while the sum is 34.

The square root of 726121771 is about 26946.6467487144. The cubic root of 726121771 is about 898.8139813744.

The spelling of 726121771 in words is "seven hundred twenty-six million, one hundred twenty-one thousand, seven hundred seventy-one".