28931170417657 has 2 divisors, whose sum is σ = 28931170417658. Its totient is φ = 28931170417656.

The previous prime is 28931170417631. The next prime is 28931170417717. The reversal of 28931170417657 is 75671407113982.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14875299636201 + 14055870781456 = 3856851^2 + 3749116^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28931170417657 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 28931170417595 and 28931170417604.

It is not a weakly prime, because it can be changed into another prime (28931170417607) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14465585208828 + 14465585208829.

It is an arithmetic number, because the mean of its divisors is an integer number (14465585208829).

It is a 1-persistent number, because it is pandigital, but 2⋅28931170417657 = 57862340835314 is not.

Almost surely, 2^{28931170417657} is an apocalyptic number.

It is an amenable number.

28931170417657 is a deficient number, since it is larger than the sum of its proper divisors (1).

28931170417657 is an equidigital number, since it uses as much as digits as its factorization.

28931170417657 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 17781120, while the sum is 61.

The spelling of 28931170417657 in words is "twenty-eight trillion, nine hundred thirty-one billion, one hundred seventy million, four hundred seventeen thousand, six hundred fifty-seven".