129804551 has 4 divisors (see below), whose sum is σ = 134280600. Its totient is φ = 125328504.

The previous prime is 129804539. The next prime is 129804557. The reversal of 129804551 is 155408921.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 155408921 = 31 ⋅5013191.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-129804551 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129804557) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2237981 + ... + 2238038.

It is an arithmetic number, because the mean of its divisors is an integer number (33570150).

Almost surely, 2^129804551 is an apocalyptic number.

129804551 is a deficient number, since it is larger than the sum of its proper divisors (4476049).

129804551 is an equidigital number, since it uses as much as digits as its factorization.

129804551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4476048.

The product of its (nonzero) digits is 14400, while the sum is 35.

The square root of 129804551 is about 11393.1800213988. The cubic root of 129804551 is about 506.3257015078.

The spelling of 129804551 in words is "one hundred twenty-nine million, eight hundred four thousand, five hundred fifty-one".