251121410145 has 12 divisors (see below), whose sum is σ = 435277110996. Its totient is φ = 133931418720.

The previous prime is 251121410107. The next prime is 251121410147. The reversal of 251121410145 is 541014121152.

251121410145 is a `hidden beast` number, since 2 + 511 + 2 + 1 + 4 + 1 + 0 + 145 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 136417945104 + 114703465041 = 369348^2 + 338679^2 .

It is not a de Polignac number, because 251121410145 - 2¹³ = 251121401953 is a prime.

It is not an unprimeable number, because it can be changed into a prime (251121410147) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2790237846 + ... + 2790237935.

It is an arithmetic number, because the mean of its divisors is an integer number (36273092583).

Almost surely, 2^251121410145 is an apocalyptic number.

It is an amenable number.

251121410145 is a deficient number, since it is larger than the sum of its proper divisors (184155700851).

251121410145 is a wasteful number, since it uses less digits than its factorization.

251121410145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5580475792 (or 5580475789 counting only the distinct ones).

The product of its (nonzero) digits is 1600, while the sum is 27.

Adding to 251121410145 its reverse (541014121152), we get a palindrome (792135531297).

The spelling of 251121410145 in words is "two hundred fifty-one billion, one hundred twenty-one million, four hundred ten thousand, one hundred forty-five".