28332131 has 2 divisors, whose sum is σ = 28332132. Its totient is φ = 28332130.

The previous prime is 28332077. The next prime is 28332163. The reversal of 28332131 is 13123382.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28332131 is a prime.

It is a super-2 number, since 2×28332131² = 1605419294002322, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 28332097 and 28332106.

It is not a weakly prime, because it can be changed into another prime (28332181) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14166065 + 14166066.

It is an arithmetic number, because the mean of its divisors is an integer number (14166066).

Almost surely, 2^28332131 is an apocalyptic number.

28332131 is a deficient number, since it is larger than the sum of its proper divisors (1).

28332131 is an equidigital number, since it uses as much as digits as its factorization.

28332131 is an evil number, because the sum of its binary digits is even.

The product of its digits is 864, while the sum is 23.

The square root of 28332131 is about 5322.7935334747. The cubic root of 28332131 is about 304.8548301356.

The spelling of 28332131 in words is "twenty-eight million, three hundred thirty-two thousand, one hundred thirty-one".