28136551 has 2 divisors, whose sum is σ = 28136552. Its totient is φ = 28136550.

The previous prime is 28136531. The next prime is 28136557. The reversal of 28136551 is 15563182.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 28136551 - 2¹¹ = 28134503 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28136557) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14068275 + 14068276.

It is an arithmetic number, because the mean of its divisors is an integer number (14068276).

Almost surely, 2^28136551 is an apocalyptic number.

28136551 is a deficient number, since it is larger than the sum of its proper divisors (1).

28136551 is an equidigital number, since it uses as much as digits as its factorization.

28136551 is an evil number, because the sum of its binary digits is even.

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

The square root of 28136551 is about 5304.3897858283. The cubic root of 28136551 is about 304.1517269783.

The spelling of 28136551 in words is "twenty-eight million, one hundred thirty-six thousand, five hundred fifty-one".