129988493 has 2 divisors, whose sum is σ = 129988494. Its totient is φ = 129988492.

The previous prime is 129988483. The next prime is 129988513. The reversal of 129988493 is 394889921.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 94906564 + 35081929 = 9742^2 + 5923^2 .

It is a cyclic number.

It is not a de Polignac number, because 129988493 - 2⁶ = 129988429 is a prime.

It is a super-2 number, since 2×129988493² = 33794016624822098, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (129988403) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64994246 + 64994247.

It is an arithmetic number, because the mean of its divisors is an integer number (64994247).

Almost surely, 2^129988493 is an apocalyptic number.

It is an amenable number.

129988493 is a deficient number, since it is larger than the sum of its proper divisors (1).

129988493 is an equidigital number, since it uses as much as digits as its factorization.

129988493 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1119744, while the sum is 53.

The square root of 129988493 is about 11401.2496244929. The cubic root of 129988493 is about 506.5647547700.

The spelling of 129988493 in words is "one hundred twenty-nine million, nine hundred eighty-eight thousand, four hundred ninety-three".