1988862641 has 2 divisors, whose sum is σ = 1988862642. Its totient is φ = 1988862640.

The previous prime is 1988862587. The next prime is 1988862649. The reversal of 1988862641 is 1462688891.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1953993616 + 34869025 = 44204^2 + 5905^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1988862641 is a prime.

It is not a weakly prime, because it can be changed into another prime (1988862649) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 994431320 + 994431321.

It is an arithmetic number, because the mean of its divisors is an integer number (994431321).

Almost surely, 2^1988862641 is an apocalyptic number.

It is an amenable number.

1988862641 is a deficient number, since it is larger than the sum of its proper divisors (1).

1988862641 is an equidigital number, since it uses as much as digits as its factorization.

1988862641 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1327104, while the sum is 53.

The square root of 1988862641 is about 44596.6662543289. Note that the first 3 decimals coincide. The cubic root of 1988862641 is about 1257.5779964190.

The spelling of 1988862641 in words is "one billion, nine hundred eighty-eight million, eight hundred sixty-two thousand, six hundred forty-one".