655331 has 2 divisors, whose sum is σ = 655332. Its totient is φ = 655330.

The previous prime is 655301. The next prime is 655337. The reversal of 655331 is 133556.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 655331 - 2⁶ = 655267 is a prime.

It is a super-2 number, since 2×655331² = 858917439122, which contains 22 as substring.

It is a nialpdrome in base 10.

It is a junction number, because it is equal to n+sod(n) for n = 655297 and 655306.

It is not a weakly prime, because it can be changed into another prime (655337) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 327665 + 327666.

It is an arithmetic number, because the mean of its divisors is an integer number (327666).

2⁶⁵⁵³³¹ is an apocalyptic number.

655331 is a deficient number, since it is larger than the sum of its proper divisors (1).

655331 is an equidigital number, since it uses as much as digits as its factorization.

655331 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1350, while the sum is 23.

The square root of 655331 is about 809.5251694666. The cubic root of 655331 is about 86.8600824929.

Adding to 655331 its reverse (133556), we get a palindrome (788887).

The spelling of 655331 in words is "six hundred fifty-five thousand, three hundred thirty-one".