251223453161 has 2 divisors, whose sum is σ = 251223453162. Its totient is φ = 251223453160.

The previous prime is 251223453149. The next prime is 251223453263. The reversal of 251223453161 is 161354322152.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 250581337561 + 642115600 = 500581^2 + 25340^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-251223453161 is a prime.

It is a super-2 number, since 2×251223453161² (a number of 24 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (251223456161) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 125611726580 + 125611726581.

It is an arithmetic number, because the mean of its divisors is an integer number (125611726581).

Almost surely, 2^251223453161 is an apocalyptic number.

It is an amenable number.

251223453161 is a deficient number, since it is larger than the sum of its proper divisors (1).

251223453161 is an equidigital number, since it uses as much as digits as its factorization.

251223453161 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 43200, while the sum is 35.

The spelling of 251223453161 in words is "two hundred fifty-one billion, two hundred twenty-three million, four hundred fifty-three thousand, one hundred sixty-one".