489660251 has 2 divisors, whose sum is σ = 489660252. Its totient is φ = 489660250.

The previous prime is 489660247. The next prime is 489660323. The reversal of 489660251 is 152066984.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 489660251 - 2² = 489660247 is a prime.

It is a super-2 number, since 2×489660251² = 479534322818766002, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 489660199 and 489660208.

It is not a weakly prime, because it can be changed into another prime (489660551) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 244830125 + 244830126.

It is an arithmetic number, because the mean of its divisors is an integer number (244830126).

Almost surely, 2^489660251 is an apocalyptic number.

489660251 is a deficient number, since it is larger than the sum of its proper divisors (1).

489660251 is an equidigital number, since it uses as much as digits as its factorization.

489660251 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 103680, while the sum is 41.

The square root of 489660251 is about 22128.2681428077. The cubic root of 489660251 is about 788.1912639000.

The spelling of 489660251 in words is "four hundred eighty-nine million, six hundred sixty thousand, two hundred fifty-one".