743220991 has 2 divisors, whose sum is σ = 743220992. Its totient is φ = 743220990.

The previous prime is 743220937. The next prime is 743220997. The reversal of 743220991 is 199022347.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 743220991 - 2²³ = 734832383 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 743220991.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (743220997) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 371610495 + 371610496.

It is an arithmetic number, because the mean of its divisors is an integer number (371610496).

Almost surely, 2^743220991 is an apocalyptic number.

743220991 is a deficient number, since it is larger than the sum of its proper divisors (1).

743220991 is an equidigital number, since it uses as much as digits as its factorization.

743220991 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 27216, while the sum is 37.

The square root of 743220991 is about 27262.0797262425. The cubic root of 743220991 is about 905.8146124165.

The spelling of 743220991 in words is "seven hundred forty-three million, two hundred twenty thousand, nine hundred ninety-one".