720331901 has 2 divisors, whose sum is σ = 720331902. Its totient is φ = 720331900.

The previous prime is 720331897. The next prime is 720331943. The reversal of 720331901 is 109133027.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 506295001 + 214036900 = 22501^2 + 14630^2 .

It is a cyclic number.

It is not a de Polignac number, because 720331901 - 2² = 720331897 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (720331951) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 360165950 + 360165951.

It is an arithmetic number, because the mean of its divisors is an integer number (360165951).

Almost surely, 2^720331901 is an apocalyptic number.

It is an amenable number.

720331901 is a deficient number, since it is larger than the sum of its proper divisors (1).

720331901 is an equidigital number, since it uses as much as digits as its factorization.

720331901 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1134, while the sum is 26.

The square root of 720331901 is about 26838.9996274079. Note that the first 3 decimals coincide. The cubic root of 720331901 is about 896.4186487769.

Adding to 720331901 its reverse (109133027), we get a palindrome (829464928).

The spelling of 720331901 in words is "seven hundred twenty million, three hundred thirty-one thousand, nine hundred one".