28531503121 has 16 divisors (see below), whose sum is σ = 34690714560. Its totient is φ = 23127137280.

The previous prime is 28531503097. The next prime is 28531503127. The reversal of 28531503121 is 12130513582.

It is not a de Polignac number, because 28531503121 - 2⁵ = 28531503089 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28531503127) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4011576 + ... + 4018681.

It is an arithmetic number, because the mean of its divisors is an integer number (2168169660).

Almost surely, 2^28531503121 is an apocalyptic number.

It is an amenable number.

28531503121 is a deficient number, since it is larger than the sum of its proper divisors (6159211439).

28531503121 is a wasteful number, since it uses less digits than its factorization.

28531503121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8030304.

The product of its (nonzero) digits is 7200, while the sum is 31.

The spelling of 28531503121 in words is "twenty-eight billion, five hundred thirty-one million, five hundred three thousand, one hundred twenty-one".