1255442257 has 2 divisors, whose sum is σ = 1255442258. Its totient is φ = 1255442256.

The previous prime is 1255442131. The next prime is 1255442267. The reversal of 1255442257 is 7522445521.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1039675536 + 215766721 = 32244^2 + 14689^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1255442257 is a prime.

It is a super-2 number, since 2×1255442257² = 3152270521322508098, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1255442267) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 627721128 + 627721129.

It is an arithmetic number, because the mean of its divisors is an integer number (627721129).

Almost surely, 2^1255442257 is an apocalyptic number.

It is an amenable number.

1255442257 is a deficient number, since it is larger than the sum of its proper divisors (1).

1255442257 is an equidigital number, since it uses as much as digits as its factorization.

1255442257 is an evil number, because the sum of its binary digits is even.

The product of its digits is 112000, while the sum is 37.

The square root of 1255442257 is about 35432.2206049804. The cubic root of 1255442257 is about 1078.7784133102.

Adding to 1255442257 its reverse (7522445521), we get a palindrome (8777887778).

The spelling of 1255442257 in words is "one billion, two hundred fifty-five million, four hundred forty-two thousand, two hundred fifty-seven".