913016021 has 2 divisors, whose sum is σ = 913016022. Its totient is φ = 913016020.

The previous prime is 913016011. The next prime is 913016047. The reversal of 913016021 is 120610319.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 778131025 + 134884996 = 27895^2 + 11614^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-913016021 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (913016011) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 456508010 + 456508011.

It is an arithmetic number, because the mean of its divisors is an integer number (456508011).

Almost surely, 2^913016021 is an apocalyptic number.

It is an amenable number.

913016021 is a deficient number, since it is larger than the sum of its proper divisors (1).

913016021 is an equidigital number, since it uses as much as digits as its factorization.

913016021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 324, while the sum is 23.

The square root of 913016021 is about 30216.1549671695. The cubic root of 913016021 is about 970.1215070801.

The spelling of 913016021 in words is "nine hundred thirteen million, sixteen thousand, twenty-one".