916855421 has 2 divisors, whose sum is σ = 916855422. Its totient is φ = 916855420.

The previous prime is 916855397. The next prime is 916855487. The reversal of 916855421 is 124558619.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 915062500 + 1792921 = 30250^2 + 1339^2 .

It is a cyclic number.

It is not a de Polignac number, because 916855421 - 2¹⁴ = 916839037 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (916855921) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 458427710 + 458427711.

It is an arithmetic number, because the mean of its divisors is an integer number (458427711).

Almost surely, 2^916855421 is an apocalyptic number.

It is an amenable number.

916855421 is a deficient number, since it is larger than the sum of its proper divisors (1).

916855421 is an equidigital number, since it uses as much as digits as its factorization.

916855421 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 86400, while the sum is 41.

The square root of 916855421 is about 30279.6205557467. The cubic root of 916855421 is about 971.4794517375.

The spelling of 916855421 in words is "nine hundred sixteen million, eight hundred fifty-five thousand, four hundred twenty-one".