249528047 has 4 divisors (see below), whose sum is σ = 250247496. Its totient is φ = 248808600.

The previous prime is 249528043. The next prime is 249528067. The reversal of 249528047 is 740825942.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 249528047 - 2² = 249528043 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 249527995 and 249528013.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (249528043) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 359204 + ... + 359897.

It is an arithmetic number, because the mean of its divisors is an integer number (62561874).

Almost surely, 2^249528047 is an apocalyptic number.

249528047 is a deficient number, since it is larger than the sum of its proper divisors (719449).

249528047 is an equidigital number, since it uses as much as digits as its factorization.

249528047 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 719448.

The product of its (nonzero) digits is 161280, while the sum is 41.

The square root of 249528047 is about 15796.4567862543. The cubic root of 249528047 is about 629.5638595532.

The spelling of 249528047 in words is "two hundred forty-nine million, five hundred twenty-eight thousand, forty-seven".