634636322101 has 4 divisors (see below), whose sum is σ = 634676481900. Its totient is φ = 634596162304.

The previous prime is 634636322083. The next prime is 634636322141. The reversal of 634636322101 is 101223636436.

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 11712867076 + 622923455025 = 108226^2 + 789255^2 .

It is a cyclic number.

It is not a de Polignac number, because 634636322101 - 2⁷ = 634636321973 is a prime.

It is a super-2 number, since 2×634636322101² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (634636322141) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20056186 + ... + 20087803.

It is an arithmetic number, because the mean of its divisors is an integer number (158669120475).

Almost surely, 2^634636322101 is an apocalyptic number.

It is an amenable number.

634636322101 is a deficient number, since it is larger than the sum of its proper divisors (40159799).

634636322101 is a wasteful number, since it uses less digits than its factorization.

634636322101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40159798.

The product of its (nonzero) digits is 93312, while the sum is 37.

Adding to 634636322101 its reverse (101223636436), we get a palindrome (735859958537).

The spelling of 634636322101 in words is "six hundred thirty-four billion, six hundred thirty-six million, three hundred twenty-two thousand, one hundred one".