1256216153 has 2 divisors, whose sum is σ = 1256216154. Its totient is φ = 1256216152.

The previous prime is 1256216149. The next prime is 1256216167. The reversal of 1256216153 is 3516126521.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1248420889 + 7795264 = 35333^2 + 2792^2 .

It is a cyclic number.

It is not a de Polignac number, because 1256216153 - 2² = 1256216149 is a prime.

It is not a weakly prime, because it can be changed into another prime (1256216183) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 628108076 + 628108077.

It is an arithmetic number, because the mean of its divisors is an integer number (628108077).

Almost surely, 2^1256216153 is an apocalyptic number.

It is an amenable number.

1256216153 is a deficient number, since it is larger than the sum of its proper divisors (1).

1256216153 is an equidigital number, since it uses as much as digits as its factorization.

1256216153 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10800, while the sum is 32.

The square root of 1256216153 is about 35443.1397170172. The cubic root of 1256216153 is about 1079.0000326393. Note that the first 4 decimals are identical.

The spelling of 1256216153 in words is "one billion, two hundred fifty-six million, two hundred sixteen thousand, one hundred fifty-three".