251121741 has 16 divisors (see below), whose sum is σ = 362753664. Its totient is φ = 153607104.

The previous prime is 251121737. The next prime is 251121743. The reversal of 251121741 is 147121152.

It is not a de Polignac number, because 251121741 - 2² = 251121737 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (251121743) 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 15 ways as a sum of consecutive naturals, for example, 12766 + ... + 25791.

It is an arithmetic number, because the mean of its divisors is an integer number (22672104).

Almost surely, 2^251121741 is an apocalyptic number.

It is an amenable number.

251121741 is a deficient number, since it is larger than the sum of its proper divisors (111631923).

251121741 is a wasteful number, since it uses less digits than its factorization.

251121741 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38740.

The product of its digits is 560, while the sum is 24.

The square root of 251121741 is about 15846.8211638802. The cubic root of 251121741 is about 630.9013226378.

Adding to 251121741 its reverse (147121152), we get a palindrome (398242893).

The spelling of 251121741 in words is "two hundred fifty-one million, one hundred twenty-one thousand, seven hundred forty-one".