28193551 has 2 divisors, whose sum is σ = 28193552. Its totient is φ = 28193550.

The previous prime is 28193521. The next prime is 28193569. The reversal of 28193551 is 15539182.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28193551 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28193521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14096775 + 14096776.

It is an arithmetic number, because the mean of its divisors is an integer number (14096776).

Almost surely, 2^28193551 is an apocalyptic number.

28193551 is a deficient number, since it is larger than the sum of its proper divisors (1).

28193551 is an equidigital number, since it uses as much as digits as its factorization.

28193551 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10800, while the sum is 34.

The square root of 28193551 is about 5309.7599757428. The cubic root of 28193551 is about 304.3569754768.

The spelling of 28193551 in words is "twenty-eight million, one hundred ninety-three thousand, five hundred fifty-one".