746821909 has 2 divisors, whose sum is σ = 746821910. Its totient is φ = 746821908.

The previous prime is 746821897. The next prime is 746821919. The reversal of 746821909 is 909128647.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 745563025 + 1258884 = 27305^2 + 1122^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-746821909 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (746821919) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 373410954 + 373410955.

It is an arithmetic number, because the mean of its divisors is an integer number (373410955).

Almost surely, 2^746821909 is an apocalyptic number.

It is an amenable number.

746821909 is a deficient number, since it is larger than the sum of its proper divisors (1).

746821909 is an equidigital number, since it uses as much as digits as its factorization.

746821909 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 217728, while the sum is 46.

The square root of 746821909 is about 27328.0425387549. The cubic root of 746821909 is about 907.2751517664.

The spelling of 746821909 in words is "seven hundred forty-six million, eight hundred twenty-one thousand, nine hundred nine".