28149941 has 2 divisors, whose sum is σ = 28149942. Its totient is φ = 28149940.

The previous prime is 28149911. The next prime is 28149949. The reversal of 28149941 is 14994182.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20702500 + 7447441 = 4550^2 + 2729^2 .

It is a cyclic number.

It is not a de Polignac number, because 28149941 - 2¹⁰ = 28148917 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 28149895 and 28149904.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28149949) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14074970 + 14074971.

It is an arithmetic number, because the mean of its divisors is an integer number (14074971).

Almost surely, 2^28149941 is an apocalyptic number.

It is an amenable number.

28149941 is a deficient number, since it is larger than the sum of its proper divisors (1).

28149941 is an equidigital number, since it uses as much as digits as its factorization.

28149941 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 20736, while the sum is 38.

The square root of 28149941 is about 5305.6517978473. The cubic root of 28149941 is about 304.1999672638.

The spelling of 28149941 in words is "twenty-eight million, one hundred forty-nine thousand, nine hundred forty-one".