655831 has 4 divisors (see below), whose sum is σ = 715464. Its totient is φ = 596200.

The previous prime is 655807. The next prime is 655847. The reversal of 655831 is 138556.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 655831 - 2¹⁹ = 131543 is a prime.

It is a super-2 number, since 2×655831² = 860228601122, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 655831.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (655331) 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, 29800 + ... + 29821.

It is an arithmetic number, because the mean of its divisors is an integer number (178866).

2⁶⁵⁵⁸³¹ is an apocalyptic number.

655831 is a deficient number, since it is larger than the sum of its proper divisors (59633).

655831 is a wasteful number, since it uses less digits than its factorization.

655831 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 59632.

The product of its digits is 3600, while the sum is 28.

The square root of 655831 is about 809.8339335938. The cubic root of 655831 is about 86.8821675159.

The spelling of 655831 in words is "six hundred fifty-five thousand, eight hundred thirty-one".