2487239981 has 2 divisors, whose sum is σ = 2487239982. Its totient is φ = 2487239980.

The previous prime is 2487239969. The next prime is 2487240017. The reversal of 2487239981 is 1899327842.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1594724356 + 892515625 = 39934^2 + 29875^2 .

It is a cyclic number.

It is not a de Polignac number, because 2487239981 - 2¹⁸ = 2486977837 is a prime.

It is a super-2 number, since 2×2487239981² = 12372725446169760722, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2487239921) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1243619990 + 1243619991.

It is an arithmetic number, because the mean of its divisors is an integer number (1243619991).

Almost surely, 2^2487239981 is an apocalyptic number.

It is an amenable number.

2487239981 is a deficient number, since it is larger than the sum of its proper divisors (1).

2487239981 is an equidigital number, since it uses as much as digits as its factorization.

2487239981 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1741824, while the sum is 53.

The square root of 2487239981 is about 49872.2365750725. The cubic root of 2487239981 is about 1354.8958005955.

The spelling of 2487239981 in words is "two billion, four hundred eighty-seven million, two hundred thirty-nine thousand, nine hundred eighty-one".