1831354249 has 2 divisors, whose sum is σ = 1831354250. Its totient is φ = 1831354248.

The previous prime is 1831354243. The next prime is 1831354253. The reversal of 1831354249 is 9424531381.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1586588224 + 244766025 = 39832^2 + 15645^2 .

It is an emirp because it is prime and its reverse (9424531381) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1831354249 is a prime.

It is not a weakly prime, because it can be changed into another prime (1831354243) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 915677124 + 915677125.

It is an arithmetic number, because the mean of its divisors is an integer number (915677125).

Almost surely, 2^1831354249 is an apocalyptic number.

It is an amenable number.

1831354249 is a deficient number, since it is larger than the sum of its proper divisors (1).

1831354249 is an equidigital number, since it uses as much as digits as its factorization.

1831354249 is an evil number, because the sum of its binary digits is even.

The product of its digits is 103680, while the sum is 40.

The square root of 1831354249 is about 42794.3249625461. The cubic root of 1831354249 is about 1223.4628503090.

The spelling of 1831354249 in words is "one billion, eight hundred thirty-one million, three hundred fifty-four thousand, two hundred forty-nine".