249020557 has 4 divisors (see below), whose sum is σ = 249053020. Its totient is φ = 248988096.

The previous prime is 249020549. The next prime is 249020579. The reversal of 249020557 is 755020942.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 47692836 + 201327721 = 6906^2 + 14189^2 .

It is a cyclic number.

It is not a de Polignac number, because 249020557 - 2³ = 249020549 is a prime.

It is a super-2 number, since 2×249020557² = 124022475617180498, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (249020537) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2419 + ... + 22447.

It is an arithmetic number, because the mean of its divisors is an integer number (62263255).

Almost surely, 2^249020557 is an apocalyptic number.

It is an amenable number.

249020557 is a deficient number, since it is larger than the sum of its proper divisors (32463).

249020557 is a wasteful number, since it uses less digits than its factorization.

249020557 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32462.

The product of its (nonzero) digits is 25200, while the sum is 34.

The square root of 249020557 is about 15780.3851980869. The cubic root of 249020557 is about 629.1367676760.

The spelling of 249020557 in words is "two hundred forty-nine million, twenty thousand, five hundred fifty-seven".