1831547149 has 2 divisors, whose sum is σ = 1831547150. Its totient is φ = 1831547148.

The previous prime is 1831547147. The next prime is 1831547167. The reversal of 1831547149 is 9417451381.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1406775049 + 424772100 = 37507^2 + 20610^2 .

It is a cyclic number.

It is not a de Polignac number, because 1831547149 - 2¹ = 1831547147 is a prime.

Together with 1831547147, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1831547147) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 915773574 + 915773575.

It is an arithmetic number, because the mean of its divisors is an integer number (915773575).

Almost surely, 2^1831547149 is an apocalyptic number.

It is an amenable number.

1831547149 is a deficient number, since it is larger than the sum of its proper divisors (1).

1831547149 is an equidigital number, since it uses as much as digits as its factorization.

1831547149 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 120960, while the sum is 43.

The square root of 1831547149 is about 42796.5787067144. The cubic root of 1831547149 is about 1223.5058053513.

The spelling of 1831547149 in words is "one billion, eight hundred thirty-one million, five hundred forty-seven thousand, one hundred forty-nine".