656139241 has 16 divisors (see below), whose sum is σ = 695302720. Its totient is φ = 618425280.

The previous prime is 656139229. The next prime is 656139251. The reversal of 656139241 is 142931656.

It is a cyclic number.

It is not a de Polignac number, because 656139241 - 2⁹ = 656138729 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (37).

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 656139241.

It is not an unprimeable number, because it can be changed into a prime (656139251) 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, 149050 + ... + 153388.

It is an arithmetic number, because the mean of its divisors is an integer number (43456420).

Almost surely, 2^656139241 is an apocalyptic number.

656139241 is a gapful number since it is divisible by the number (61) formed by its first and last digit.

It is an amenable number.

656139241 is a deficient number, since it is larger than the sum of its proper divisors (39163479).

656139241 is a wasteful number, since it uses less digits than its factorization.

656139241 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4504.

The product of its digits is 38880, while the sum is 37.

The square root of 656139241 is about 25615.2150293532. The cubic root of 656139241 is about 868.9577694252.

The spelling of 656139241 in words is "six hundred fifty-six million, one hundred thirty-nine thousand, two hundred forty-one".