521245489 has 2 divisors, whose sum is σ = 521245490. Its totient is φ = 521245488.

The previous prime is 521245457. The next prime is 521245519. The reversal of 521245489 is 984542125.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 492085489 + 29160000 = 22183^2 + 5400^2 .

It is a cyclic number.

It is not a de Polignac number, because 521245489 - 2⁵ = 521245457 is a prime.

It is not a weakly prime, because it can be changed into another prime (521245289) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 260622744 + 260622745.

It is an arithmetic number, because the mean of its divisors is an integer number (260622745).

Almost surely, 2^521245489 is an apocalyptic number.

It is an amenable number.

521245489 is a deficient number, since it is larger than the sum of its proper divisors (1).

521245489 is an equidigital number, since it uses as much as digits as its factorization.

521245489 is an evil number, because the sum of its binary digits is even.

The product of its digits is 115200, while the sum is 40.

The square root of 521245489 is about 22830.8013218984. The cubic root of 521245489 is about 804.7866615718.

The spelling of 521245489 in words is "five hundred twenty-one million, two hundred forty-five thousand, four hundred eighty-nine".