1251100427 has 2 divisors, whose sum is σ = 1251100428. Its totient is φ = 1251100426.

The previous prime is 1251100349. The next prime is 1251100451. The reversal of 1251100427 is 7240011521.

It is a strong prime.

It is an emirp because it is prime and its reverse (7240011521) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1251100427 is a prime.

It is not a weakly prime, because it can be changed into another prime (1251100027) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 625550213 + 625550214.

It is an arithmetic number, because the mean of its divisors is an integer number (625550214).

Almost surely, 2^1251100427 is an apocalyptic number.

1251100427 is a deficient number, since it is larger than the sum of its proper divisors (1).

1251100427 is an equidigital number, since it uses as much as digits as its factorization.

1251100427 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 560, while the sum is 23.

The square root of 1251100427 is about 35370.8980236578. The cubic root of 1251100427 is about 1077.5333587144.

Adding to 1251100427 its reverse (7240011521), we get a palindrome (8491111948).

The spelling of 1251100427 in words is "one billion, two hundred fifty-one million, one hundred thousand, four hundred twenty-seven".