249263845 has 16 divisors (see below), whose sum is σ = 309918960. Its totient is φ = 192231424.

The previous prime is 249263837. The next prime is 249263879. The reversal of 249263845 is 548362942.

It can be written as a sum of positive squares in 8 ways, for example, as 4435236 + 244828609 = 2106^2 + 15647^2 .

It is a cyclic number.

It is not a de Polignac number, because 249263845 - 2³ = 249263837 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 146037 + ... + 147733.

It is an arithmetic number, because the mean of its divisors is an integer number (19369935).

Almost surely, 2^249263845 is an apocalyptic number.

It is an amenable number.

249263845 is a deficient number, since it is larger than the sum of its proper divisors (60655115).

249263845 is a wasteful number, since it uses less digits than its factorization.

249263845 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2744.

The product of its digits is 414720, while the sum is 43.

The square root of 249263845 is about 15788.0918733076. The cubic root of 249263845 is about 629.3415855819.

The spelling of 249263845 in words is "two hundred forty-nine million, two hundred sixty-three thousand, eight hundred forty-five".