603968921 has 2 divisors, whose sum is σ = 603968922. Its totient is φ = 603968920.

The previous prime is 603968917. The next prime is 603968929. The reversal of 603968921 is 129869306.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 509179225 + 94789696 = 22565^2 + 9736^2 .

It is a cyclic number.

It is not a de Polignac number, because 603968921 - 2² = 603968917 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (603968929) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 301984460 + 301984461.

It is an arithmetic number, because the mean of its divisors is an integer number (301984461).

Almost surely, 2^603968921 is an apocalyptic number.

It is an amenable number.

603968921 is a deficient number, since it is larger than the sum of its proper divisors (1).

603968921 is an equidigital number, since it uses as much as digits as its factorization.

603968921 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 139968, while the sum is 44.

The square root of 603968921 is about 24575.7791534673. The cubic root of 603968921 is about 845.2883116873.

The spelling of 603968921 in words is "six hundred three million, nine hundred sixty-eight thousand, nine hundred twenty-one".