1691228389149 has 40 divisors (see below), whose sum is σ = 2720934491352. Its totient is φ = 1040682142080.

The previous prime is 1691228389133. The next prime is 1691228389163. The reversal of 1691228389149 is 9419838221961.

1691228389149 is a `hidden beast` number, since 1 + 6 + 91 + 2 + 28 + 389 + 149 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 7574220900 + 1683654168249 = 87030^2 + 1297557^2 .

It is not a de Polignac number, because 1691228389149 - 2⁴ = 1691228389133 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1691228389349) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 17318439 + ... + 17415819.

Almost surely, 2^{1691228389149} is an apocalyptic number.

It is an amenable number.

1691228389149 is a deficient number, since it is larger than the sum of its proper divisors (1029706102203).

1691228389149 is a wasteful number, since it uses less digits than its factorization.

1691228389149 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 113899 (or 113890 counting only the distinct ones).

The product of its digits is 13436928, while the sum is 63.

The spelling of 1691228389149 in words is "one trillion, six hundred ninety-one billion, two hundred twenty-eight million, three hundred eighty-nine thousand, one hundred forty-nine".