249121605 has 16 divisors (see below), whose sum is σ = 404210304. Its totient is φ = 130992960.

The previous prime is 249121603. The next prime is 249121619. The reversal of 249121605 is 506121942.

It is not a de Polignac number, because 249121605 - 2¹ = 249121603 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (249121603) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 115894 + ... + 118023.

It is an arithmetic number, because the mean of its divisors is an integer number (25263144).

Almost surely, 2^249121605 is an apocalyptic number.

It is an amenable number.

249121605 is a deficient number, since it is larger than the sum of its proper divisors (155088699).

249121605 is a wasteful number, since it uses less digits than its factorization.

249121605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 233996.

The product of its (nonzero) digits is 4320, while the sum is 30.

The square root of 249121605 is about 15783.5865695982. The cubic root of 249121605 is about 629.2218535767.

The spelling of 249121605 in words is "two hundred forty-nine million, one hundred twenty-one thousand, six hundred five".