128772001 has 2 divisors, whose sum is σ = 128772002. Its totient is φ = 128772000.

The previous prime is 128771983. The next prime is 128772013. The reversal of 128772001 is 100277821.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 116661601 + 12110400 = 10801^2 + 3480^2 .

It is a cyclic number.

It is not a de Polignac number, because 128772001 - 2⁵ = 128771969 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (128772041) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64386000 + 64386001.

It is an arithmetic number, because the mean of its divisors is an integer number (64386001).

Almost surely, 2^128772001 is an apocalyptic number.

It is an amenable number.

128772001 is a deficient number, since it is larger than the sum of its proper divisors (1).

128772001 is an equidigital number, since it uses as much as digits as its factorization.

128772001 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1568, while the sum is 28.

The square root of 128772001 is about 11347.7751563908. The cubic root of 128772001 is about 504.9795776468.

It can be divided in two parts, 12877 and 2001, that added together give a triangular number (14878 = T₁₇₂).

The spelling of 128772001 in words is "one hundred twenty-eight million, seven hundred seventy-two thousand, one".