921288413 has 2 divisors, whose sum is σ = 921288414. Its totient is φ = 921288412.

The previous prime is 921288377. The next prime is 921288439. The reversal of 921288413 is 314882129.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 605799769 + 315488644 = 24613^2 + 17762^2 .

It is an emirp because it is prime and its reverse (314882129) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 921288413 - 2¹⁸ = 921026269 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 (921288013) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 460644206 + 460644207.

It is an arithmetic number, because the mean of its divisors is an integer number (460644207).

Almost surely, 2^921288413 is an apocalyptic number.

It is an amenable number.

921288413 is a deficient number, since it is larger than the sum of its proper divisors (1).

921288413 is an equidigital number, since it uses as much as digits as its factorization.

921288413 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 27648, while the sum is 38.

The square root of 921288413 is about 30352.7332047709. The cubic root of 921288413 is about 973.0426347610.

The spelling of 921288413 in words is "nine hundred twenty-one million, two hundred eighty-eight thousand, four hundred thirteen".