1251120199 has 4 divisors (see below), whose sum is σ = 1429851664. Its totient is φ = 1072388736.

The previous prime is 1251120197. The next prime is 1251120223. The reversal of 1251120199 is 9910211521.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1251120199 - 2¹ = 1251120197 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1251120199.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1251120197) 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 in 3 ways as a sum of consecutive naturals, for example, 89365722 + ... + 89365735.

It is an arithmetic number, because the mean of its divisors is an integer number (357462916).

Almost surely, 2^1251120199 is an apocalyptic number.

1251120199 is a deficient number, since it is larger than the sum of its proper divisors (178731465).

1251120199 is an equidigital number, since it uses as much as digits as its factorization.

1251120199 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 178731464.

The product of its (nonzero) digits is 1620, while the sum is 31.

The square root of 1251120199 is about 35371.1775178605. The cubic root of 1251120199 is about 1077.5390350180.

The spelling of 1251120199 in words is "one billion, two hundred fifty-one million, one hundred twenty thousand, one hundred ninety-nine".