28111651 has 2 divisors, whose sum is σ = 28111652. Its totient is φ = 28111650.

The previous prime is 28111649. The next prime is 28111661. The reversal of 28111651 is 15611182.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 28111651 - 2¹ = 28111649 is a prime.

Together with 28111649, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (28111661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14055825 + 14055826.

It is an arithmetic number, because the mean of its divisors is an integer number (14055826).

Almost surely, 2^28111651 is an apocalyptic number.

28111651 is a deficient number, since it is larger than the sum of its proper divisors (1).

28111651 is an equidigital number, since it uses as much as digits as its factorization.

28111651 is an evil number, because the sum of its binary digits is even.

The product of its digits is 480, while the sum is 25.

The square root of 28111651 is about 5302.0421537366. The cubic root of 28111651 is about 304.0619787931.

The spelling of 28111651 in words is "twenty-eight million, one hundred eleven thousand, six hundred fifty-one".