1274639189 has 2 divisors, whose sum is σ = 1274639190. Its totient is φ = 1274639188.

The previous prime is 1274639173. The next prime is 1274639207. The reversal of 1274639189 is 9819364721.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1170803089 + 103836100 = 34217^2 + 10190^2 .

It is a cyclic number.

It is not a de Polignac number, because 1274639189 - 2⁴ = 1274639173 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1274639689) 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 as a sum of consecutive naturals, namely, 637319594 + 637319595.

It is an arithmetic number, because the mean of its divisors is an integer number (637319595).

Almost surely, 2^1274639189 is an apocalyptic number.

It is an amenable number.

1274639189 is a deficient number, since it is larger than the sum of its proper divisors (1).

1274639189 is an equidigital number, since it uses as much as digits as its factorization.

1274639189 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 653184, while the sum is 50.

The square root of 1274639189 is about 35702.0894206488. The cubic root of 1274639189 is about 1084.2491464577.

The spelling of 1274639189 in words is "one billion, two hundred seventy-four million, six hundred thirty-nine thousand, one hundred eighty-nine".