655051 has 4 divisors (see below), whose sum is σ = 656704. Its totient is φ = 653400.

The previous prime is 655043. The next prime is 655069. The reversal of 655051 is 150556.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a 3-Lehmer number, since φ(655051) divides (655051-1)³.

It is a cyclic number.

It is not a de Polignac number, because 655051 - 2³ = 655043 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (655001) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 166 + ... + 1156.

It is an arithmetic number, because the mean of its divisors is an integer number (164176).

2⁶⁵⁵⁰⁵¹ is an apocalyptic number.

655051 is the 661-st pentagonal number.

655051 is a deficient number, since it is larger than the sum of its proper divisors (1653).

655051 is an equidigital number, since it uses as much as digits as its factorization.

655051 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1652.

The product of its (nonzero) digits is 750, while the sum is 22.

The square root of 655051 is about 809.3522101039. The cubic root of 655051 is about 86.8477099729.

The spelling of 655051 in words is "six hundred fifty-five thousand, fifty-one".