494128981 has 2 divisors, whose sum is σ = 494128982. Its totient is φ = 494128980.

The previous prime is 494128951. The next prime is 494129003. The reversal of 494128981 is 189821494.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 472366756 + 21762225 = 21734^2 + 4665^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-494128981 is a prime.

It is a super-2 number, since 2×494128981² = 488326899728196722, 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 (494128931) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 247064490 + 247064491.

It is an arithmetic number, because the mean of its divisors is an integer number (247064491).

Almost surely, 2^494128981 is an apocalyptic number.

It is an amenable number.

494128981 is a deficient number, since it is larger than the sum of its proper divisors (1).

494128981 is an equidigital number, since it uses as much as digits as its factorization.

494128981 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 165888, while the sum is 46.

The square root of 494128981 is about 22229.0121462921. The cubic root of 494128981 is about 790.5817330361.

The spelling of 494128981 in words is "four hundred ninety-four million, one hundred twenty-eight thousand, nine hundred eighty-one".