128641851 has 20 divisors (see below), whose sum is σ = 206952592. Its totient is φ = 79163568.

The previous prime is 128641831. The next prime is 128641871. The reversal of 128641851 is 158146821.

128641851 is a `hidden beast` number, since 1 + 2 + 8 + 641 + 8 + 5 + 1 = 666.

It is an interprime number because it is at equal distance from previous prime (128641831) and next prime (128641871).

It is not a de Polignac number, because 128641851 - 2¹⁸ = 128379707 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (128641811) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 60031 + ... + 62136.

Almost surely, 2^128641851 is an apocalyptic number.

128641851 is a deficient number, since it is larger than the sum of its proper divisors (78310741).

128641851 is a wasteful number, since it uses less digits than its factorization.

128641851 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 122192 (or 122183 counting only the distinct ones).

The product of its digits is 15360, while the sum is 36.

The square root of 128641851 is about 11342.0391023837. The cubic root of 128641851 is about 504.8093924976.

The spelling of 128641851 in words is "one hundred twenty-eight million, six hundred forty-one thousand, eight hundred fifty-one".