726798991 has 2 divisors, whose sum is σ = 726798992. Its totient is φ = 726798990.

The previous prime is 726798983. The next prime is 726799013. The reversal of 726798991 is 199897627.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 726798991 - 2³ = 726798983 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (726798901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 363399495 + 363399496.

It is an arithmetic number, because the mean of its divisors is an integer number (363399496).

Almost surely, 2^726798991 is an apocalyptic number.

726798991 is a deficient number, since it is larger than the sum of its proper divisors (1).

726798991 is an equidigital number, since it uses as much as digits as its factorization.

726798991 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3429216, while the sum is 58.

The square root of 726798991 is about 26959.2097621573. The cubic root of 726798991 is about 899.0933218804.

The spelling of 726798991 in words is "seven hundred twenty-six million, seven hundred ninety-eight thousand, nine hundred ninety-one".