1255500251 has 2 divisors, whose sum is σ = 1255500252. Its totient is φ = 1255500250.

The previous prime is 1255500187. The next prime is 1255500263. The reversal of 1255500251 is 1520055521.

It is a strong prime.

It is an emirp because it is prime and its reverse (1520055521) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1255500251 - 2⁶ = 1255500187 is a prime.

It is a super-2 number, since 2×1255500251² = 3152561760522126002, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1255500251.

It is not a weakly prime, because it can be changed into another prime (1255503251) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 627750125 + 627750126.

It is an arithmetic number, because the mean of its divisors is an integer number (627750126).

Almost surely, 2^1255500251 is an apocalyptic number.

1255500251 is a deficient number, since it is larger than the sum of its proper divisors (1).

1255500251 is an equidigital number, since it uses as much as digits as its factorization.

1255500251 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2500, while the sum is 26.

The square root of 1255500251 is about 35433.0389749454. The cubic root of 1255500251 is about 1078.7950241132.

Adding to 1255500251 its reverse (1520055521), we get a palindrome (2775555772).

The spelling of 1255500251 in words is "one billion, two hundred fifty-five million, five hundred thousand, two hundred fifty-one".