249728553 has 6 divisors (see below), whose sum is σ = 360719034. Its totient is φ = 166485696.

The previous prime is 249728543. The next prime is 249728561. The reversal of 249728553 is 355827942.

249728553 is a `hidden beast` number, since 2 + 4 + 97 + 2 + 8 + 553 = 666.

249728553 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 177342489 + 72386064 = 13317^2 + 8508^2 .

It is not a de Polignac number, because 249728553 - 2¹⁰ = 249727529 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 249728499 and 249728508.

It is not an unprimeable number, because it can be changed into a prime (249728543) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 13873800 + ... + 13873817.

It is an arithmetic number, because the mean of its divisors is an integer number (60119839).

Almost surely, 2^249728553 is an apocalyptic number.

It is an amenable number.

249728553 is a deficient number, since it is larger than the sum of its proper divisors (110990481).

249728553 is a wasteful number, since it uses less digits than its factorization.

249728553 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27747623 (or 27747620 counting only the distinct ones).

The product of its digits is 604800, while the sum is 45.

The square root of 249728553 is about 15802.8020616598. The cubic root of 249728553 is about 629.7324411845.

The spelling of 249728553 in words is "two hundred forty-nine million, seven hundred twenty-eight thousand, five hundred fifty-three".