256216249 has 2 divisors, whose sum is σ = 256216250. Its totient is φ = 256216248.

The previous prime is 256216237. The next prime is 256216253. The reversal of 256216249 is 942612652.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 169130025 + 87086224 = 13005^2 + 9332^2 .

It is a cyclic number.

It is not a de Polignac number, because 256216249 - 2²¹ = 254119097 is a prime.

It is not a weakly prime, because it can be changed into another prime (256216229) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128108124 + 128108125.

It is an arithmetic number, because the mean of its divisors is an integer number (128108125).

Almost surely, 2^256216249 is an apocalyptic number.

It is an amenable number.

256216249 is a deficient number, since it is larger than the sum of its proper divisors (1).

256216249 is an equidigital number, since it uses as much as digits as its factorization.

256216249 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 51840, while the sum is 37.

The square root of 256216249 is about 16006.7563547397. The cubic root of 256216249 is about 635.1391589531.

The spelling of 256216249 in words is "two hundred fifty-six million, two hundred sixteen thousand, two hundred forty-nine".