129242156401 has 4 divisors (see below), whose sum is σ = 129302864100. Its totient is φ = 129181448704.

The previous prime is 129242156359. The next prime is 129242156419. The reversal of 129242156401 is 104651242921.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 77520480625 + 51721675776 = 278425^2 + 227424^2 .

It is a cyclic number.

It is not a de Polignac number, because 129242156401 - 2¹⁷ = 129242025329 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (129242156431) 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, 30350656 + ... + 30354913.

It is an arithmetic number, because the mean of its divisors is an integer number (32325716025).

Almost surely, 2^129242156401 is an apocalyptic number.

It is an amenable number.

129242156401 is a deficient number, since it is larger than the sum of its proper divisors (60707699).

129242156401 is an equidigital number, since it uses as much as digits as its factorization.

129242156401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60707698.

The product of its (nonzero) digits is 34560, while the sum is 37.

The spelling of 129242156401 in words is "one hundred twenty-nine billion, two hundred forty-two million, one hundred fifty-six thousand, four hundred one".