1851152249 has 4 divisors (see below), whose sum is σ = 1856992164. Its totient is φ = 1845312336.

The previous prime is 1851152231. The next prime is 1851152339. The reversal of 1851152249 is 9422511581.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9422511581 = 7 ⋅1346073083.

It can be written as a sum of positive squares in 2 ways, for example, as 53392249 + 1797760000 = 7307^2 + 42400^2 .

It is a cyclic number.

It is not a de Polignac number, because 1851152249 - 2⁸ = 1851151993 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1851152209) 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, 2919482 + ... + 2920115.

It is an arithmetic number, because the mean of its divisors is an integer number (464248041).

Almost surely, 2^1851152249 is an apocalyptic number.

It is an amenable number.

1851152249 is a deficient number, since it is larger than the sum of its proper divisors (5839915).

1851152249 is an equidigital number, since it uses as much as digits as its factorization.

1851152249 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5839914.

The product of its digits is 28800, while the sum is 38.

The square root of 1851152249 is about 43025.0188727443. The cubic root of 1851152249 is about 1227.8558385324.

The spelling of 1851152249 in words is "one billion, eight hundred fifty-one million, one hundred fifty-two thousand, two hundred forty-nine".