102128091 has 16 divisors (see below), whose sum is σ = 149052960. Its totient is φ = 61816320.

The previous prime is 102128087. The next prime is 102128093. The reversal of 102128091 is 190821201.

It is not a de Polignac number, because 102128091 - 2² = 102128087 is a prime.

It is not an unprimeable number, because it can be changed into a prime (102128093) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19086 + ... + 23843.

It is an arithmetic number, because the mean of its divisors is an integer number (9315810).

Almost surely, 2^102128091 is an apocalyptic number.

102128091 is a deficient number, since it is larger than the sum of its proper divisors (46924869).

102128091 is a wasteful number, since it uses less digits than its factorization.

102128091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43006.

The product of its (nonzero) digits is 288, while the sum is 24.

The square root of 102128091 is about 10105.8443981688. The cubic root of 102128091 is about 467.4283737865.

Adding to 102128091 its reverse (190821201), we get a palindrome (292949292).

The spelling of 102128091 in words is "one hundred two million, one hundred twenty-eight thousand, ninety-one".