1256200469 has 2 divisors, whose sum is σ = 1256200470. Its totient is φ = 1256200468.

The previous prime is 1256200433. The next prime is 1256200471. The reversal of 1256200469 is 9640026521.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1229554225 + 26646244 = 35065^2 + 5162^2 .

It is a cyclic number.

It is not a de Polignac number, because 1256200469 - 2⁸ = 1256200213 is a prime.

It is a super-2 number, since 2×1256200469² = 3156079236631639922, which contains 22 as substring.

Together with 1256200471, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1256200069) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 628100234 + 628100235.

It is an arithmetic number, because the mean of its divisors is an integer number (628100235).

Almost surely, 2^1256200469 is an apocalyptic number.

It is an amenable number.

1256200469 is a deficient number, since it is larger than the sum of its proper divisors (1).

1256200469 is an equidigital number, since it uses as much as digits as its factorization.

1256200469 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 25920, while the sum is 35.

The square root of 1256200469 is about 35442.9184605331. The cubic root of 1256200469 is about 1078.9955421417.

The spelling of 1256200469 in words is "one billion, two hundred fifty-six million, two hundred thousand, four hundred sixty-nine".