256007137 has 2 divisors, whose sum is σ = 256007138. Its totient is φ = 256007136.

The previous prime is 256007117. The next prime is 256007173. The reversal of 256007137 is 731700652.

Together with next prime (256007173) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 222725776 + 33281361 = 14924^2 + 5769^2 .

It is a cyclic number.

It is not a de Polignac number, because 256007137 - 2⁷ = 256007009 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 256007099 and 256007108.

It is not a weakly prime, because it can be changed into another prime (256007117) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128003568 + 128003569.

It is an arithmetic number, because the mean of its divisors is an integer number (128003569).

Almost surely, 2^256007137 is an apocalyptic number.

It is an amenable number.

256007137 is a deficient number, since it is larger than the sum of its proper divisors (1).

256007137 is an equidigital number, since it uses as much as digits as its factorization.

256007137 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8820, while the sum is 31.

The square root of 256007137 is about 16000.2230296956. The cubic root of 256007137 is about 634.9663213998.

Adding to 256007137 its reverse (731700652), we get a palindrome (987707789).

The spelling of 256007137 in words is "two hundred fifty-six million, seven thousand, one hundred thirty-seven".