129761893 has 2 divisors, whose sum is σ = 129761894. Its totient is φ = 129761892.

The previous prime is 129761767. The next prime is 129761909. The reversal of 129761893 is 398167921.

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., 74080449 + 55681444 = 8607^2 + 7462^2 .

It is a cyclic number.

It is not a de Polignac number, because 129761893 - 2²¹ = 127664741 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (129765893) 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, 64880946 + 64880947.

It is an arithmetic number, because the mean of its divisors is an integer number (64880947).

Almost surely, 2^129761893 is an apocalyptic number.

It is an amenable number.

129761893 is a deficient number, since it is larger than the sum of its proper divisors (1).

129761893 is an equidigital number, since it uses as much as digits as its factorization.

129761893 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 163296, while the sum is 46.

The square root of 129761893 is about 11391.3077826912. The cubic root of 129761893 is about 506.2702303961.

It can be divided in two parts, 1297 and 61893, that added together give a triangular number (63190 = T₃₅₅).

The spelling of 129761893 in words is "one hundred twenty-nine million, seven hundred sixty-one thousand, eight hundred ninety-three".