129515043841 has 8 divisors (see below), whose sum is σ = 129756334568. Its totient is φ = 129273840000.

The previous prime is 129515043821. The next prime is 129515043893. The reversal of 129515043841 is 148340515921.

It can be written as a sum of positive squares in 4 ways, for example, as 35004913216 + 94510130625 = 187096^2 + 307425^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-129515043841 is a prime.

It is a super-2 number, since 2×129515043841² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (129515043821) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3479911 + ... + 3516931.

It is an arithmetic number, because the mean of its divisors is an integer number (16219541821).

Almost surely, 2^129515043841 is an apocalyptic number.

It is an amenable number.

129515043841 is a deficient number, since it is larger than the sum of its proper divisors (241290727).

129515043841 is an equidigital number, since it uses as much as digits as its factorization.

129515043841 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43443.

The product of its (nonzero) digits is 172800, while the sum is 43.

The spelling of 129515043841 in words is "one hundred twenty-nine billion, five hundred fifteen million, forty-three thousand, eight hundred forty-one".