251224434361 has 2 divisors, whose sum is σ = 251224434362. Its totient is φ = 251224434360.

The previous prime is 251224434359. The next prime is 251224434367. The reversal of 251224434361 is 163434422152.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 215244035136 + 35980399225 = 463944^2 + 189685^2 .

It is a cyclic number.

It is not a de Polignac number, because 251224434361 - 2¹ = 251224434359 is a prime.

It is a super-2 number, since 2×251224434361² (a number of 24 digits) contains 22 as substring.

Together with 251224434359, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 251224434361.

It is not a weakly prime, because it can be changed into another prime (251224434367) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 125612217180 + 125612217181.

It is an arithmetic number, because the mean of its divisors is an integer number (125612217181).

Almost surely, 2^251224434361 is an apocalyptic number.

It is an amenable number.

251224434361 is a deficient number, since it is larger than the sum of its proper divisors (1).

251224434361 is an equidigital number, since it uses as much as digits as its factorization.

251224434361 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 138240, while the sum is 37.

The spelling of 251224434361 in words is "two hundred fifty-one billion, two hundred twenty-four million, four hundred thirty-four thousand, three hundred sixty-one".