4256687969 has 2 divisors, whose sum is σ = 4256687970. Its totient is φ = 4256687968.

The previous prime is 4256687917. The next prime is 4256687983. The reversal of 4256687969 is 9697866524.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3059527969 + 1197160000 = 55313^2 + 34600^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-4256687969 is a prime.

It is a super-2 number, since 2×4256687969² = 36238784930858689922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (4256683969) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2128343984 + 2128343985.

It is an arithmetic number, because the mean of its divisors is an integer number (2128343985).

Almost surely, 2^4256687969 is an apocalyptic number.

It is an amenable number.

4256687969 is a deficient number, since it is larger than the sum of its proper divisors (1).

4256687969 is an equidigital number, since it uses as much as digits as its factorization.

4256687969 is an evil number, because the sum of its binary digits is even.

The product of its digits is 39191040, while the sum is 62.

The square root of 4256687969 is about 65243.2982688644. The cubic root of 4256687969 is about 1620.6551189986.

The spelling of 4256687969 in words is "four billion, two hundred fifty-six million, six hundred eighty-seven thousand, nine hundred sixty-nine".