256170437 has 2 divisors, whose sum is σ = 256170438. Its totient is φ = 256170436.

The previous prime is 256170371. The next prime is 256170449. The reversal of 256170437 is 734071652.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 192904321 + 63266116 = 13889^2 + 7954^2 .

It is a cyclic number.

It is not a de Polignac number, because 256170437 - 2²² = 251976133 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 256170397 and 256170406.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (256170457) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128085218 + 128085219.

It is an arithmetic number, because the mean of its divisors is an integer number (128085219).

Almost surely, 2^256170437 is an apocalyptic number.

It is an amenable number.

256170437 is a deficient number, since it is larger than the sum of its proper divisors (1).

256170437 is an equidigital number, since it uses as much as digits as its factorization.

256170437 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 35280, while the sum is 35.

The square root of 256170437 is about 16005.3252700468. The cubic root of 256170437 is about 635.1013019610.

The spelling of 256170437 in words is "two hundred fifty-six million, one hundred seventy thousand, four hundred thirty-seven".