655081 has 12 divisors (see below), whose sum is σ = 790020. Its totient is φ = 540960.

The previous prime is 655069. The next prime is 655087. The reversal of 655081 is 180556.

It can be written as a sum of positive squares in 2 ways, for example, as 275625 + 379456 = 525^2 + 616^2 .

It is not a de Polignac number, because 655081 - 2¹¹ = 653033 is a prime.

It is a super-2 number, since 2×655081² = 858262233122, which contains 22 as substring.

655081 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (655087) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1191 + ... + 1651.

It is an arithmetic number, because the mean of its divisors is an integer number (65835).

2⁶⁵⁵⁰⁸¹ is an apocalyptic number.

It is an amenable number.

655081 is a deficient number, since it is larger than the sum of its proper divisors (134939).

655081 is a wasteful number, since it uses less digits than its factorization.

655081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 504 (or 497 counting only the distinct ones).

The product of its (nonzero) digits is 1200, while the sum is 25.

The square root of 655081 is about 809.3707432320. The cubic root of 655081 is about 86.8490357686.

The spelling of 655081 in words is "six hundred fifty-five thousand, eighty-one".