656582987 has 2 divisors, whose sum is σ = 656582988. Its totient is φ = 656582986.

The previous prime is 656582963. The next prime is 656582989. The reversal of 656582987 is 789285656.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 656582987 - 2¹² = 656578891 is a prime.

It is a super-2 number, since 2×656582987² = 862202437635684338, which contains 22 as substring.

Together with 656582989, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (656582989) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 328291493 + 328291494.

It is an arithmetic number, because the mean of its divisors is an integer number (328291494).

Almost surely, 2^656582987 is an apocalyptic number.

656582987 is a deficient number, since it is larger than the sum of its proper divisors (1).

656582987 is an equidigital number, since it uses as much as digits as its factorization.

656582987 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7257600, while the sum is 56.

The square root of 656582987 is about 25623.8753314170. The cubic root of 656582987 is about 869.1536169002.

The spelling of 656582987 in words is "six hundred fifty-six million, five hundred eighty-two thousand, nine hundred eighty-seven".