139812989 has 2 divisors, whose sum is σ = 139812990. Its totient is φ = 139812988.

The previous prime is 139812943. The next prime is 139813027. The reversal of 139812989 is 989218931.

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., 91968100 + 47844889 = 9590^2 + 6917^2 .

It is a cyclic number.

It is not a de Polignac number, because 139812989 - 2¹⁶ = 139747453 is a prime.

It is a super-2 number, since 2×139812989² = 39095343786228242, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (139811989) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69906494 + 69906495.

It is an arithmetic number, because the mean of its divisors is an integer number (69906495).

Almost surely, 2^139812989 is an apocalyptic number.

It is an amenable number.

139812989 is a deficient number, since it is larger than the sum of its proper divisors (1).

139812989 is an equidigital number, since it uses as much as digits as its factorization.

139812989 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 279936, while the sum is 50.

The square root of 139812989 is about 11824.2542682403. The cubic root of 139812989 is about 519.0181039444.

The spelling of 139812989 in words is "one hundred thirty-nine million, eight hundred twelve thousand, nine hundred eighty-nine".