28149491 has 2 divisors, whose sum is σ = 28149492. Its totient is φ = 28149490.

The previous prime is 28149481. The next prime is 28149503. The reversal of 28149491 is 19494182.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 28149491 - 2¹⁸ = 27887347 is a prime.

It is a super-3 number, since 3×28149491³ (a number of 23 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (28149421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14074745 + 14074746.

It is an arithmetic number, because the mean of its divisors is an integer number (14074746).

Almost surely, 2^28149491 is an apocalyptic number.

28149491 is a deficient number, since it is larger than the sum of its proper divisors (1).

28149491 is an equidigital number, since it uses as much as digits as its factorization.

28149491 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 28149491 is about 5305.6093900701. The cubic root of 28149491 is about 304.1983462928.

The spelling of 28149491 in words is "twenty-eight million, one hundred forty-nine thousand, four hundred ninety-one".