494631581 has 2 divisors, whose sum is σ = 494631582. Its totient is φ = 494631580.

The previous prime is 494631559. The next prime is 494631607. The reversal of 494631581 is 185136494.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 465092356 + 29539225 = 21566^2 + 5435^2 .

It is a cyclic number.

It is not a de Polignac number, because 494631581 - 2¹⁰ = 494630557 is a prime.

It is a super-2 number, since 2×494631581² = 489320801845119122, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (494631521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 247315790 + 247315791.

It is an arithmetic number, because the mean of its divisors is an integer number (247315791).

Almost surely, 2^494631581 is an apocalyptic number.

It is an amenable number.

494631581 is a deficient number, since it is larger than the sum of its proper divisors (1).

494631581 is an equidigital number, since it uses as much as digits as its factorization.

494631581 is an evil number, because the sum of its binary digits is even.

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

The square root of 494631581 is about 22240.3143188220. The cubic root of 494631581 is about 790.8496871878.

The spelling of 494631581 in words is "four hundred ninety-four million, six hundred thirty-one thousand, five hundred eighty-one".