1256570197 has 2 divisors, whose sum is σ = 1256570198. Its totient is φ = 1256570196.

The previous prime is 1256570191. The next prime is 1256570219. The reversal of 1256570197 is 7910756521.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 779191396 + 477378801 = 27914^2 + 21849^2 .

It is a cyclic number.

It is not a de Polignac number, because 1256570197 - 2¹⁹ = 1256045909 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1256570191) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 628285098 + 628285099.

It is an arithmetic number, because the mean of its divisors is an integer number (628285099).

Almost surely, 2^1256570197 is an apocalyptic number.

It is an amenable number.

1256570197 is a deficient number, since it is larger than the sum of its proper divisors (1).

1256570197 is an equidigital number, since it uses as much as digits as its factorization.

1256570197 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 132300, while the sum is 43.

The square root of 1256570197 is about 35448.1339001082. The cubic root of 1256570197 is about 1079.1013892952.

The spelling of 1256570197 in words is "one billion, two hundred fifty-six million, five hundred seventy thousand, one hundred ninety-seven".