129927601 has 4 divisors (see below), whose sum is σ = 129964900. Its totient is φ = 129890304.

The previous prime is 129927593. The next prime is 129927613. The reversal of 129927601 is 106729921.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 106729921 = 8647 ⋅12343.

It can be written as a sum of positive squares in 2 ways, for example, as 55950400 + 73977201 = 7480^2 + 8601^2 .

It is a cyclic number.

It is not a de Polignac number, because 129927601 - 2³ = 129927593 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (129927691) 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, 12816 + ... + 20593.

It is an arithmetic number, because the mean of its divisors is an integer number (32491225).

Almost surely, 2^129927601 is an apocalyptic number.

It is an amenable number.

129927601 is a deficient number, since it is larger than the sum of its proper divisors (37299).

129927601 is an equidigital number, since it uses as much as digits as its factorization.

129927601 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37298.

The product of its (nonzero) digits is 13608, while the sum is 37.

The square root of 129927601 is about 11398.5789026527. The cubic root of 129927601 is about 506.4856437706.

It can be divided in two parts, 1299 and 27601, that added together give a square (28900 = 170²).

The spelling of 129927601 in words is "one hundred twenty-nine million, nine hundred twenty-seven thousand, six hundred one".