249151121 has 4 divisors (see below), whose sum is σ = 250332144. Its totient is φ = 247970100.

The previous prime is 249151109. The next prime is 249151153. The reversal of 249151121 is 121151942.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-249151121 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (249151171) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 590195 + ... + 590616.

It is an arithmetic number, because the mean of its divisors is an integer number (62583036).

Almost surely, 2^249151121 is an apocalyptic number.

It is an amenable number.

249151121 is a deficient number, since it is larger than the sum of its proper divisors (1181023).

249151121 is a wasteful number, since it uses less digits than its factorization.

249151121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1181022.

The product of its digits is 720, while the sum is 26.

The square root of 249151121 is about 15784.5215638612. The cubic root of 249151121 is about 629.2467027246.

The spelling of 249151121 in words is "two hundred forty-nine million, one hundred fifty-one thousand, one hundred twenty-one".