7256434121 has 2 divisors, whose sum is σ = 7256434122. Its totient is φ = 7256434120.

The previous prime is 7256434099. The next prime is 7256434123. The reversal of 7256434121 is 1214346527.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5649626896 + 1606807225 = 75164^2 + 40085^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7256434121 is a prime.

Together with 7256434123, 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 (7256434123) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3628217060 + 3628217061.

It is an arithmetic number, because the mean of its divisors is an integer number (3628217061).

Almost surely, 2^7256434121 is an apocalyptic number.

It is an amenable number.

7256434121 is a deficient number, since it is larger than the sum of its proper divisors (1).

7256434121 is an equidigital number, since it uses as much as digits as its factorization.

7256434121 is an evil number, because the sum of its binary digits is even.

The product of its digits is 40320, while the sum is 35.

The square root of 7256434121 is about 85184.7059101574. The cubic root of 7256434121 is about 1936.0106955937.

The spelling of 7256434121 in words is "seven billion, two hundred fifty-six million, four hundred thirty-four thousand, one hundred twenty-one".