1894451149 has 2 divisors, whose sum is σ = 1894451150. Its totient is φ = 1894451148.

The previous prime is 1894451147. The next prime is 1894451191. The reversal of 1894451149 is 9411544981.

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., 1103435524 + 791015625 = 33218^2 + 28125^2 .

It is a cyclic number.

It is not a de Polignac number, because 1894451149 - 2¹ = 1894451147 is a prime.

Together with 1894451147, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 1894451099 and 1894451108.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1894451147) 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, 947225574 + 947225575.

It is an arithmetic number, because the mean of its divisors is an integer number (947225575).

Almost surely, 2^1894451149 is an apocalyptic number.

It is an amenable number.

1894451149 is a deficient number, since it is larger than the sum of its proper divisors (1).

1894451149 is an equidigital number, since it uses as much as digits as its factorization.

1894451149 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 207360, while the sum is 46.

The square root of 1894451149 is about 43525.2932098108. The cubic root of 1894451149 is about 1237.3554350596.

The spelling of 1894451149 in words is "one billion, eight hundred ninety-four million, four hundred fifty-one thousand, one hundred forty-nine".