9981969139 has 2 divisors, whose sum is σ = 9981969140. Its totient is φ = 9981969138.

The previous prime is 9981969083. The next prime is 9981969163. The reversal of 9981969139 is 9319691899.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 9981969139 - 2²¹ = 9979871987 is a prime.

It is not a weakly prime, because it can be changed into another prime (9981969199) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4990984569 + 4990984570.

It is an arithmetic number, because the mean of its divisors is an integer number (4990984570).

Almost surely, 2^9981969139 is an apocalyptic number.

9981969139 is a deficient number, since it is larger than the sum of its proper divisors (1).

9981969139 is an equidigital number, since it uses as much as digits as its factorization.

9981969139 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8503056, while the sum is 64.

The square root of 9981969139 is about 99909.8050193273. The cubic root of 9981969139 is about 2153.1390339121.

The spelling of 9981969139 in words is "nine billion, nine hundred eighty-one million, nine hundred sixty-nine thousand, one hundred thirty-nine".