655643131 has 16 divisors (see below), whose sum is σ = 815578848. Its totient is φ = 517824000.

The previous prime is 655643099. The next prime is 655643137. The reversal of 655643131 is 131346556.

It is a cyclic number.

It is not a de Polignac number, because 655643131 - 2⁵ = 655643099 is a prime.

It is a super-2 number, since 2×655643131² = 859735830454966322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (655643137) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 132420 + ... + 137281.

It is an arithmetic number, because the mean of its divisors is an integer number (50973678).

Almost surely, 2^655643131 is an apocalyptic number.

655643131 is a deficient number, since it is larger than the sum of its proper divisors (159935717).

655643131 is a wasteful number, since it uses less digits than its factorization.

655643131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 269742.

The product of its digits is 32400, while the sum is 34.

The square root of 655643131 is about 25605.5293052106. The cubic root of 655643131 is about 868.7387065040.

Adding to 655643131 its reverse (131346556), we get a palindrome (786989687).

The spelling of 655643131 in words is "six hundred fifty-five million, six hundred forty-three thousand, one hundred thirty-one".