634506161 has 2 divisors, whose sum is σ = 634506162. Its totient is φ = 634506160.

The previous prime is 634506143. The next prime is 634506193. The reversal of 634506161 is 161605436.

It is an a-pointer prime, because the next prime (634506193) can be obtained adding 634506161 to its sum of digits (32).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 491464561 + 143041600 = 22169^2 + 11960^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-634506161 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (634596161) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 317253080 + 317253081.

It is an arithmetic number, because the mean of its divisors is an integer number (317253081).

Almost surely, 2^634506161 is an apocalyptic number.

It is an amenable number.

634506161 is a deficient number, since it is larger than the sum of its proper divisors (1).

634506161 is an equidigital number, since it uses as much as digits as its factorization.

634506161 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12960, while the sum is 32.

The square root of 634506161 is about 25189.4057293935. The cubic root of 634506161 is about 859.3009286523.

The spelling of 634506161 in words is "six hundred thirty-four million, five hundred six thousand, one hundred sixty-one".