436987981 has 2 divisors, whose sum is σ = 436987982. Its totient is φ = 436987980.

The previous prime is 436987937. The next prime is 436988023. The reversal of 436987981 is 189789634.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 419840100 + 17147881 = 20490^2 + 4141^2 .

It is a cyclic number.

It is not a de Polignac number, because 436987981 - 2⁷ = 436987853 is a prime.

It is a super-2 number, since 2×436987981² = 381916991076912722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (436987931) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 218493990 + 218493991.

It is an arithmetic number, because the mean of its divisors is an integer number (218493991).

Almost surely, 2^436987981 is an apocalyptic number.

It is an amenable number.

436987981 is a deficient number, since it is larger than the sum of its proper divisors (1).

436987981 is an equidigital number, since it uses as much as digits as its factorization.

436987981 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2612736, while the sum is 55.

The square root of 436987981 is about 20904.2574850196. The cubic root of 436987981 is about 758.8509766484.

The spelling of 436987981 in words is "four hundred thirty-six million, nine hundred eighty-seven thousand, nine hundred eighty-one".