656212001 has 2 divisors, whose sum is σ = 656212002. Its totient is φ = 656212000.

The previous prime is 656211989. The next prime is 656212069. The reversal of 656212001 is 100212656.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 438944401 + 217267600 = 20951^2 + 14740^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-656212001 is a prime.

It is a super-2 number, since 2×656212001² = 861228380512848002, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (656212901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 328106000 + 328106001.

It is an arithmetic number, because the mean of its divisors is an integer number (328106001).

Almost surely, 2^656212001 is an apocalyptic number.

It is an amenable number.

656212001 is a deficient number, since it is larger than the sum of its proper divisors (1).

656212001 is an equidigital number, since it uses as much as digits as its factorization.

656212001 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 720, while the sum is 23.

The square root of 656212001 is about 25616.6352396251. The cubic root of 656212001 is about 868.9898881313.

Adding to 656212001 its reverse (100212656), we get a palindrome (756424657).

The spelling of 656212001 in words is "six hundred fifty-six million, two hundred twelve thousand, one".