1911227138 has 18 divisors (see below), whose sum is σ = 3027529251. Its totient is φ = 904761684.

The previous prime is 1911227099. The next prime is 1911227147. The reversal of 1911227138 is 8317221191.

It can be written as a sum of positive squares in only one way, i.e., 955613569 + 955613569 = 30913^2 + 30913^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=30913.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1911227098 and 1911227107.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 1173881 + ... + 1175507.

Almost surely, 2^1911227138 is an apocalyptic number.

1911227138 is a deficient number, since it is larger than the sum of its proper divisors (1116302113).

1911227138 is an frugal number, since it uses more digits than its factorization.

1911227138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3294 (or 1648 counting only the distinct ones).

The product of its digits is 6048, while the sum is 35.

The square root of 1911227138 is about 43717.5838536395. The cubic root of 1911227138 is about 1240.9971033923.

The spelling of 1911227138 in words is "one billion, nine hundred eleven million, two hundred twenty-seven thousand, one hundred thirty-eight".