634220897 has 2 divisors, whose sum is σ = 634220898. Its totient is φ = 634220896.

The previous prime is 634220869. The next prime is 634220933. The reversal of 634220897 is 798022436.

It is a happy number.

634220897 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 324144016 + 310076881 = 18004^2 + 17609^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-634220897 is a prime.

It is a super-2 number, since 2×634220897² = 804472292382969218, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (634220597) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 317110448 + 317110449.

It is an arithmetic number, because the mean of its divisors is an integer number (317110449).

Almost surely, 2^634220897 is an apocalyptic number.

It is an amenable number.

634220897 is a deficient number, since it is larger than the sum of its proper divisors (1).

634220897 is an equidigital number, since it uses as much as digits as its factorization.

634220897 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 145152, while the sum is 41.

The square root of 634220897 is about 25183.7427123134. The cubic root of 634220897 is about 859.1721332838.

The spelling of 634220897 in words is "six hundred thirty-four million, two hundred twenty thousand, eight hundred ninety-seven".