655431 has 24 divisors (see below), whose sum is σ = 1061760. Its totient is φ = 352176.

The previous prime is 655399. The next prime is 655439. The reversal of 655431 is 134556.

It is not a de Polignac number, because 655431 - 2⁵ = 655399 is a prime.

It is a super-2 number, since 2×655431² = 859179591522, which contains 22 as substring.

655431 is a lucky number.

It is a nialpdrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (655439) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 11080 + ... + 11138.

It is an arithmetic number, because the mean of its divisors is an integer number (44240).

2⁶⁵⁵⁴³¹ is an apocalyptic number.

655431 is a deficient number, since it is larger than the sum of its proper divisors (406329).

655431 is a wasteful number, since it uses less digits than its factorization.

655431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 115 (or 92 counting only the distinct ones).

The product of its digits is 1800, while the sum is 24.

The square root of 655431 is about 809.5869317127. The cubic root of 655431 is about 86.8645003959.

Adding to 655431 its product of digits (1800), we get a triangular number (657231 = T₁₁₄₆).

Adding to 655431 its reverse (134556), we get a palindrome (789987).

The spelling of 655431 in words is "six hundred fifty-five thousand, four hundred thirty-one".