256537739 has 2 divisors, whose sum is σ = 256537740. Its totient is φ = 256537738.

The previous prime is 256537691. The next prime is 256537751. The reversal of 256537739 is 937735652.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 256537739 - 2⁸ = 256537483 is a prime.

It is a super-5 number, since 5×256537739⁵ (a number of 43 digits) contains 55555 as substring. Note that it is a super-d number also for d = 2.

It is a junction number, because it is equal to n+sod(n) for n = 256537693 and 256537702.

It is not a weakly prime, because it can be changed into another prime (256537759) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128268869 + 128268870.

It is an arithmetic number, because the mean of its divisors is an integer number (128268870).

Almost surely, 2^256537739 is an apocalyptic number.

256537739 is a deficient number, since it is larger than the sum of its proper divisors (1).

256537739 is an equidigital number, since it uses as much as digits as its factorization.

256537739 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1190700, while the sum is 47.

The square root of 256537739 is about 16016.7955284445. The cubic root of 256537739 is about 635.4046970743.

It can be divided in two parts, 2565 and 37739, that added together give a palindrome (40304).

The spelling of 256537739 in words is "two hundred fifty-six million, five hundred thirty-seven thousand, seven hundred thirty-nine".