987964981 has 2 divisors, whose sum is σ = 987964982. Its totient is φ = 987964980.

The previous prime is 987964963. The next prime is 987965057. The reversal of 987964981 is 189469789.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 689850225 + 298114756 = 26265^2 + 17266^2 .

It is a cyclic number.

It is not a de Polignac number, because 987964981 - 2²¹ = 985867829 is a prime.

It is a super-2 number, since 2×987964981² = 1952149607364660722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (987964921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 493982490 + 493982491.

It is an arithmetic number, because the mean of its divisors is an integer number (493982491).

Almost surely, 2^987964981 is an apocalyptic number.

It is an amenable number.

987964981 is a deficient number, since it is larger than the sum of its proper divisors (1).

987964981 is an equidigital number, since it uses as much as digits as its factorization.

987964981 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7838208, while the sum is 61.

The square root of 987964981 is about 31431.9102346644. The cubic root of 987964981 is about 995.9721250055.

The spelling of 987964981 in words is "nine hundred eighty-seven million, nine hundred sixty-four thousand, nine hundred eighty-one".