1251422201 has 4 divisors (see below), whose sum is σ = 1251531600. Its totient is φ = 1251312804.

The previous prime is 1251422129. The next prime is 1251422233. The reversal of 1251422201 is 1022241521.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 1022241521 = 7 ⋅146034503.

It is a cyclic number.

It is not a de Polignac number, because 1251422201 - 2¹⁰ = 1251421177 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1251422401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 35231 + ... + 61188.

It is an arithmetic number, because the mean of its divisors is an integer number (312882900).

Almost surely, 2^1251422201 is an apocalyptic number.

It is an amenable number.

1251422201 is a deficient number, since it is larger than the sum of its proper divisors (109399).

1251422201 is an equidigital number, since it uses as much as digits as its factorization.

1251422201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 109398.

The product of its (nonzero) digits is 320, while the sum is 20.

The square root of 1251422201 is about 35375.4463010716. The cubic root of 1251422201 is about 1077.6257287302.

Adding to 1251422201 its reverse (1022241521), we get a palindrome (2273663722).

The spelling of 1251422201 in words is "one billion, two hundred fifty-one million, four hundred twenty-two thousand, two hundred one".