655068121 has 6 divisors (see below), whose sum is σ = 663062570. Its totient is φ = 647168928.

The previous prime is 655068097. The next prime is 655068131. The reversal of 655068121 is 121860556.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 653518096 + 1550025 = 25564^2 + 1245^2 .

It is a de Polignac number, because none of the positive numbers 2^k-655068121 is a prime.

It is a super-2 number, since 2×655068121² = 858228486300941282, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (655068131) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 40656 + ... + 54433.

Almost surely, 2^655068121 is an apocalyptic number.

It is an amenable number.

655068121 is a deficient number, since it is larger than the sum of its proper divisors (7994449).

655068121 is an frugal number, since it uses more digits than its factorization.

655068121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 95255 (or 95172 counting only the distinct ones).

The product of its (nonzero) digits is 14400, while the sum is 34.

The square root of 655068121 is about 25594.2986033999. The cubic root of 655068121 is about 868.4846660948.

The spelling of 655068121 in words is "six hundred fifty-five million, sixty-eight thousand, one hundred twenty-one".