4497239921 has 2 divisors, whose sum is σ = 4497239922. Its totient is φ = 4497239920.

The previous prime is 4497239917. The next prime is 4497240019. The reversal of 4497239921 is 1299327944.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3512221696 + 985018225 = 59264^2 + 31385^2 .

It is a cyclic number.

It is not a de Polignac number, because 4497239921 - 2² = 4497239917 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 4497239921.

It is not a weakly prime, because it can be changed into another prime (4497239821) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2248619960 + 2248619961.

It is an arithmetic number, because the mean of its divisors is an integer number (2248619961).

Almost surely, 2^4497239921 is an apocalyptic number.

It is an amenable number.

4497239921 is a deficient number, since it is larger than the sum of its proper divisors (1).

4497239921 is an equidigital number, since it uses as much as digits as its factorization.

4497239921 is an evil number, because the sum of its binary digits is even.

The product of its digits is 979776, while the sum is 50.

The square root of 4497239921 is about 67061.4637552745. The cubic root of 4497239921 is about 1650.6260154114.

The spelling of 4497239921 in words is "four billion, four hundred ninety-seven million, two hundred thirty-nine thousand, nine hundred twenty-one".