128150861 has 2 divisors, whose sum is σ = 128150862. Its totient is φ = 128150860.

The previous prime is 128150837. The next prime is 128150887. The reversal of 128150861 is 168051821.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 103836100 + 24314761 = 10190^2 + 4931^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-128150861 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (128150261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64075430 + 64075431.

It is an arithmetic number, because the mean of its divisors is an integer number (64075431).

Almost surely, 2^128150861 is an apocalyptic number.

It is an amenable number.

128150861 is a deficient number, since it is larger than the sum of its proper divisors (1).

128150861 is an equidigital number, since it uses as much as digits as its factorization.

128150861 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3840, while the sum is 32.

The square root of 128150861 is about 11320.3737129125. The cubic root of 128150861 is about 504.1663348798.

The spelling of 128150861 in words is "one hundred twenty-eight million, one hundred fifty thousand, eight hundred sixty-one".