129487643 has 2 divisors, whose sum is σ = 129487644. Its totient is φ = 129487642.

The previous prime is 129487621. The next prime is 129487661. The reversal of 129487643 is 346784921.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 129487643 - 2¹² = 129483547 is a prime.

It is a Sophie Germain prime.

It is a junction number, because it is equal to n+sod(n) for n = 129487594 and 129487603.

It is not a weakly prime, because it can be changed into another prime (129484643) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64743821 + 64743822.

It is an arithmetic number, because the mean of its divisors is an integer number (64743822).

Almost surely, 2^129487643 is an apocalyptic number.

129487643 is a deficient number, since it is larger than the sum of its proper divisors (1).

129487643 is an equidigital number, since it uses as much as digits as its factorization.

129487643 is an evil number, because the sum of its binary digits is even.

The product of its digits is 290304, while the sum is 44.

The square root of 129487643 is about 11379.2637283789. The cubic root of 129487643 is about 505.9133137445.

The spelling of 129487643 in words is "one hundred twenty-nine million, four hundred eighty-seven thousand, six hundred forty-three".