140981989 has 2 divisors, whose sum is σ = 140981990. Its totient is φ = 140981988.

The previous prime is 140981987. The next prime is 140982007. The reversal of 140981989 is 989189041.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 83722500 + 57259489 = 9150^2 + 7567^2 .

It is an emirp because it is prime and its reverse (989189041) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 140981989 - 2¹ = 140981987 is a prime.

It is a super-2 number, since 2×140981989² = 39751842444792242, which contains 22 as substring.

Together with 140981987, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (140981983) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 70490994 + 70490995.

It is an arithmetic number, because the mean of its divisors is an integer number (70490995).

Almost surely, 2^140981989 is an apocalyptic number.

It is an amenable number.

140981989 is a deficient number, since it is larger than the sum of its proper divisors (1).

140981989 is an equidigital number, since it uses as much as digits as its factorization.

140981989 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 186624, while the sum is 49.

The square root of 140981989 is about 11873.5836629048. The cubic root of 140981989 is about 520.4606236570.

The spelling of 140981989 in words is "one hundred forty million, nine hundred eighty-one thousand, nine hundred eighty-nine".