655022121 has 32 divisors (see below), whose sum is σ = 1001226240. Its totient is φ = 377339904.

The previous prime is 655022117. The next prime is 655022197. The reversal of 655022121 is 121220556.

It is a happy number.

It is not a de Polignac number, because 655022121 - 2² = 655022117 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 655022091 and 655022100.

It is not an unprimeable number, because it can be changed into a prime (655002121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 125400 + ... + 130518.

It is an arithmetic number, because the mean of its divisors is an integer number (31288320).

Almost surely, 2^655022121 is an apocalyptic number.

It is an amenable number.

655022121 is a deficient number, since it is larger than the sum of its proper divisors (346204119).

655022121 is a wasteful number, since it uses less digits than its factorization.

655022121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5345.

The product of its (nonzero) digits is 1200, while the sum is 24.

The square root of 655022121 is about 25593.3999499871. The cubic root of 655022121 is about 868.4643367944.

Adding to 655022121 its reverse (121220556), we get a palindrome (776242677).

The spelling of 655022121 in words is "six hundred fifty-five million, twenty-two thousand, one hundred twenty-one".