501298981 has 2 divisors, whose sum is σ = 501298982. Its totient is φ = 501298980.

The previous prime is 501298969. The next prime is 501299093. The reversal of 501298981 is 189892105.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 390418081 + 110880900 = 19759^2 + 10530^2 .

It is a cyclic number.

It is not a de Polignac number, because 501298981 - 2⁵ = 501298949 is a prime.

It is a super-2 number, since 2×501298981² = 502601336703276722, which contains 22 as substring.

It is an alternating number because its digits alternate between odd and even.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (501298181) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 250649490 + 250649491.

It is an arithmetic number, because the mean of its divisors is an integer number (250649491).

Almost surely, 2^501298981 is an apocalyptic number.

It is an amenable number.

501298981 is a deficient number, since it is larger than the sum of its proper divisors (1).

501298981 is an equidigital number, since it uses as much as digits as its factorization.

501298981 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 51840, while the sum is 43.

The square root of 501298981 is about 22389.7070324736. The cubic root of 501298981 is about 794.3872662206.

The spelling of 501298981 in words is "five hundred one million, two hundred ninety-eight thousand, nine hundred eighty-one".