28321051531 has 2 divisors, whose sum is σ = 28321051532. Its totient is φ = 28321051530.

The previous prime is 28321051529. The next prime is 28321051537. The reversal of 28321051531 is 13515012382.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 28321051531 - 2¹ = 28321051529 is a prime.

It is a super-2 number, since 2×28321051531² (a number of 22 digits) contains 22 as substring.

Together with 28321051529, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 28321051493 and 28321051502.

It is not a weakly prime, because it can be changed into another prime (28321051537) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14160525765 + 14160525766.

It is an arithmetic number, because the mean of its divisors is an integer number (14160525766).

Almost surely, 2^28321051531 is an apocalyptic number.

28321051531 is a deficient number, since it is larger than the sum of its proper divisors (1).

28321051531 is an equidigital number, since it uses as much as digits as its factorization.

28321051531 is an evil number, because the sum of its binary digits is even.

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

The spelling of 28321051531 in words is "twenty-eight billion, three hundred twenty-one million, fifty-one thousand, five hundred thirty-one".