1851754249 has 2 divisors, whose sum is σ = 1851754250. Its totient is φ = 1851754248.

The previous prime is 1851754243. The next prime is 1851754253. The reversal of 1851754249 is 9424571581.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1851753024 + 1225 = 43032^2 + 35^2 .

It is an emirp because it is prime and its reverse (9424571581) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1851754249 - 2²⁹ = 1314883337 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1851754199 and 1851754208.

It is not a weakly prime, because it can be changed into another prime (1851754243) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 925877124 + 925877125.

It is an arithmetic number, because the mean of its divisors is an integer number (925877125).

Almost surely, 2^1851754249 is an apocalyptic number.

It is an amenable number.

1851754249 is a deficient number, since it is larger than the sum of its proper divisors (1).

1851754249 is an equidigital number, since it uses as much as digits as its factorization.

1851754249 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 403200, while the sum is 46.

The square root of 1851754249 is about 43032.0142335913. The cubic root of 1851754249 is about 1227.9889248489.

The spelling of 1851754249 in words is "one billion, eight hundred fifty-one million, seven hundred fifty-four thousand, two hundred forty-nine".