634503161 has 4 divisors (see below), whose sum is σ = 641632500. Its totient is φ = 627373824.

The previous prime is 634503137. The next prime is 634503173. The reversal of 634503161 is 161305436.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 433430761 + 201072400 = 20819^2 + 14180^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-634503161 is a prime.

It is a super-2 number, since 2×634503161² = 805188522637983842, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (634506161) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3564536 + ... + 3564713.

It is an arithmetic number, because the mean of its divisors is an integer number (160408125).

Almost surely, 2^634503161 is an apocalyptic number.

It is an amenable number.

634503161 is a deficient number, since it is larger than the sum of its proper divisors (7129339).

634503161 is an equidigital number, since it uses as much as digits as its factorization.

634503161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7129338.

The product of its (nonzero) digits is 6480, while the sum is 29.

The square root of 634503161 is about 25189.3461804788. The cubic root of 634503161 is about 859.2995743671.

Adding to 634503161 its reverse (161305436), we get a palindrome (795808597).

The spelling of 634503161 in words is "six hundred thirty-four million, five hundred three thousand, one hundred sixty-one".