256124173 has 2 divisors, whose sum is σ = 256124174. Its totient is φ = 256124172.

The previous prime is 256124117. The next prime is 256124179. The reversal of 256124173 is 371421652.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 191047684 + 65076489 = 13822^2 + 8067^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-256124173 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (256124179) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128062086 + 128062087.

It is an arithmetic number, because the mean of its divisors is an integer number (128062087).

Almost surely, 2^256124173 is an apocalyptic number.

It is an amenable number.

256124173 is a deficient number, since it is larger than the sum of its proper divisors (1).

256124173 is an equidigital number, since it uses as much as digits as its factorization.

256124173 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10080, while the sum is 31.

The square root of 256124173 is about 16003.8799358156. The cubic root of 256124173 is about 635.0630668756.

The spelling of 256124173 in words is "two hundred fifty-six million, one hundred twenty-four thousand, one hundred seventy-three".