656782381 has 2 divisors, whose sum is σ = 656782382. Its totient is φ = 656782380.

The previous prime is 656782363. The next prime is 656782391. The reversal of 656782381 is 183287656.

656782381 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 537776100 + 119006281 = 23190^2 + 10909^2 .

It is a cyclic number.

It is not a de Polignac number, because 656782381 - 2¹³ = 656774189 is a prime.

It is a super-2 number, since 2×656782381² = 862726191984058322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (656782351) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 328391190 + 328391191.

It is an arithmetic number, because the mean of its divisors is an integer number (328391191).

Almost surely, 2^656782381 is an apocalyptic number.

It is an amenable number.

656782381 is a deficient number, since it is larger than the sum of its proper divisors (1).

656782381 is an equidigital number, since it uses as much as digits as its factorization.

656782381 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 483840, while the sum is 46.

The square root of 656782381 is about 25627.7658214679. The cubic root of 656782381 is about 869.2415907890.

The spelling of 656782381 in words is "six hundred fifty-six million, seven hundred eighty-two thousand, three hundred eighty-one".