656201081 has 8 divisors (see below), whose sum is σ = 692025600. Its totient is φ = 620505360.

The previous prime is 656201059. The next prime is 656201083. The reversal of 656201081 is 180102656.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 656201081 - 2¹⁰ = 656200057 is a prime.

It is a super-2 number, since 2×656201081² = 861199717411137122, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (656201083) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21641 + ... + 42198.

It is an arithmetic number, because the mean of its divisors is an integer number (86503200).

Almost surely, 2^656201081 is an apocalyptic number.

It is an amenable number.

656201081 is a deficient number, since it is larger than the sum of its proper divisors (35824519).

656201081 is a wasteful number, since it uses less digits than its factorization.

656201081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64399.

The product of its (nonzero) digits is 2880, while the sum is 29.

The square root of 656201081 is about 25616.4220959915. The cubic root of 656201081 is about 868.9850678282.

The spelling of 656201081 in words is "six hundred fifty-six million, two hundred one thousand, eighty-one".