656135243 has 6 divisors (see below), whose sum is σ = 677984652. Its totient is φ = 634968660.

The previous prime is 656135239. The next prime is 656135251. The reversal of 656135243 is 342531656.

It is not a de Polignac number, because 656135243 - 2² = 656135239 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (656135203) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 340421 + ... + 342342.

It is an arithmetic number, because the mean of its divisors is an integer number (112997442).

Almost surely, 2^656135243 is an apocalyptic number.

656135243 is a deficient number, since it is larger than the sum of its proper divisors (21849409).

656135243 is an equidigital number, since it uses as much as digits as its factorization.

656135243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 682825 (or 682794 counting only the distinct ones).

The product of its digits is 64800, while the sum is 35.

The square root of 656135243 is about 25615.1369896786. The cubic root of 656135243 is about 868.9560045050.

Adding to 656135243 its reverse (342531656), we get a palindrome (998666899).

The spelling of 656135243 in words is "six hundred fifty-six million, one hundred thirty-five thousand, two hundred forty-three".