987664943 has 2 divisors, whose sum is σ = 987664944. Its totient is φ = 987664942.

The previous prime is 987664913. The next prime is 987664999. The reversal of 987664943 is 349466789.

It is an a-pointer prime, because the next prime (987664999) can be obtained adding 987664943 to its sum of digits (56).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 987664943 - 2¹⁸ = 987402799 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (987664913) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 493832471 + 493832472.

It is an arithmetic number, because the mean of its divisors is an integer number (493832472).

Almost surely, 2^987664943 is an apocalyptic number.

987664943 is a deficient number, since it is larger than the sum of its proper divisors (1).

987664943 is an equidigital number, since it uses as much as digits as its factorization.

987664943 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7838208, while the sum is 56.

The square root of 987664943 is about 31427.1370474627. The cubic root of 987664943 is about 995.8712915596.

The spelling of 987664943 in words is "nine hundred eighty-seven million, six hundred sixty-four thousand, nine hundred forty-three".