256451197 has 2 divisors, whose sum is σ = 256451198. Its totient is φ = 256451196.

The previous prime is 256451149. The next prime is 256451203. The reversal of 256451197 is 791154652.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 230705721 + 25745476 = 15189^2 + 5074^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-256451197 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (256451297) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128225598 + 128225599.

It is an arithmetic number, because the mean of its divisors is an integer number (128225599).

Almost surely, 2^256451197 is an apocalyptic number.

It is an amenable number.

256451197 is a deficient number, since it is larger than the sum of its proper divisors (1).

256451197 is an equidigital number, since it uses as much as digits as its factorization.

256451197 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 75600, while the sum is 40.

The square root of 256451197 is about 16014.0936989890. The cubic root of 256451197 is about 635.3332386109. Note that the first 3 decimals are identical.

The spelling of 256451197 in words is "two hundred fifty-six million, four hundred fifty-one thousand, one hundred ninety-seven".