128417501 has 2 divisors, whose sum is σ = 128417502. Its totient is φ = 128417500.

The previous prime is 128417467. The next prime is 128417519. The reversal of 128417501 is 105714821.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 122633476 + 5784025 = 11074^2 + 2405^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-128417501 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (128417521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64208750 + 64208751.

It is an arithmetic number, because the mean of its divisors is an integer number (64208751).

Almost surely, 2^128417501 is an apocalyptic number.

It is an amenable number.

128417501 is a deficient number, since it is larger than the sum of its proper divisors (1).

128417501 is an equidigital number, since it uses as much as digits as its factorization.

128417501 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2240, while the sum is 29.

The square root of 128417501 is about 11332.1445896176. The cubic root of 128417501 is about 504.5157610236.

The spelling of 128417501 in words is "one hundred twenty-eight million, four hundred seventeen thousand, five hundred one".