499858721 has 2 divisors, whose sum is σ = 499858722. Its totient is φ = 499858720.

The previous prime is 499858717. The next prime is 499858727. The reversal of 499858721 is 127858994.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 424360000 + 75498721 = 20600^2 + 8689^2 .

It is a cyclic number.

It is not a de Polignac number, because 499858721 - 2² = 499858717 is a prime.

It is not a weakly prime, because it can be changed into another prime (499858727) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 249929360 + 249929361.

It is an arithmetic number, because the mean of its divisors is an integer number (249929361).

Almost surely, 2^499858721 is an apocalyptic number.

It is an amenable number.

499858721 is a deficient number, since it is larger than the sum of its proper divisors (1).

499858721 is an equidigital number, since it uses as much as digits as its factorization.

499858721 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1451520, while the sum is 53.

The square root of 499858721 is about 22357.5204573316. The cubic root of 499858721 is about 793.6257634643.

The spelling of 499858721 in words is "four hundred ninety-nine million, eight hundred fifty-eight thousand, seven hundred twenty-one".