988566641 has 2 divisors, whose sum is σ = 988566642. Its totient is φ = 988566640.

The previous prime is 988566619. The next prime is 988566647. The reversal of 988566641 is 146665889.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 912946225 + 75620416 = 30215^2 + 8696^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-988566641 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (988566647) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 494283320 + 494283321.

It is an arithmetic number, because the mean of its divisors is an integer number (494283321).

Almost surely, 2^988566641 is an apocalyptic number.

It is an amenable number.

988566641 is a deficient number, since it is larger than the sum of its proper divisors (1).

988566641 is an equidigital number, since it uses as much as digits as its factorization.

988566641 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2488320, while the sum is 53.

The square root of 988566641 is about 31441.4796248523. The cubic root of 988566641 is about 996.1742627325.

The spelling of 988566641 in words is "nine hundred eighty-eight million, five hundred sixty-six thousand, six hundred forty-one".