28091616331 has 2 divisors, whose sum is σ = 28091616332. Its totient is φ = 28091616330.

The previous prime is 28091616269. The next prime is 28091616373. The reversal of 28091616331 is 13361619082.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 28091616331 - 2⁹ = 28091615819 is a prime.

It is a super-2 number, since 2×28091616331² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (28097616331) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14045808165 + 14045808166.

It is an arithmetic number, because the mean of its divisors is an integer number (14045808166).

Almost surely, 2^28091616331 is an apocalyptic number.

28091616331 is a deficient number, since it is larger than the sum of its proper divisors (1).

28091616331 is an equidigital number, since it uses as much as digits as its factorization.

28091616331 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 46656, while the sum is 40.

The spelling of 28091616331 in words is "twenty-eight billion, ninety-one million, six hundred sixteen thousand, three hundred thirty-one".