499993561 has 2 divisors, whose sum is σ = 499993562. Its totient is φ = 499993560.

The previous prime is 499993547. The next prime is 499993591. The reversal of 499993561 is 165399994.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 346704400 + 153289161 = 18620^2 + 12381^2 .

It is a cyclic number.

It is not a de Polignac number, because 499993561 - 2²¹ = 497896409 is a prime.

It is a super-2 number, since 2×499993561² = 499987122082921442, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (499993541) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 249996780 + 249996781.

It is an arithmetic number, because the mean of its divisors is an integer number (249996781).

Almost surely, 2^499993561 is an apocalyptic number.

It is an amenable number.

499993561 is a deficient number, since it is larger than the sum of its proper divisors (1).

499993561 is an equidigital number, since it uses as much as digits as its factorization.

499993561 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2361960, while the sum is 55.

The square root of 499993561 is about 22360.5357941173. The cubic root of 499993561 is about 793.6971188777.

The spelling of 499993561 in words is "four hundred ninety-nine million, nine hundred ninety-three thousand, five hundred sixty-one".