109091428 has 6 divisors (see below), whose sum is σ = 190910006. Its totient is φ = 54545712.

The previous prime is 109091401. The next prime is 109091441. The reversal of 109091428 is 824190901.

It can be written as a sum of positive squares in only one way, i.e., 108618084 + 473344 = 10422^2 + 688^2 .

It is a junction number, because it is equal to n+sod(n) for n = 109091393 and 109091402.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13636425 + ... + 13636432.

Almost surely, 2^109091428 is an apocalyptic number.

It is an amenable number.

109091428 is a deficient number, since it is larger than the sum of its proper divisors (81818578).

109091428 is a wasteful number, since it uses less digits than its factorization.

109091428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27272861 (or 27272859 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 34.

The square root of 109091428 is about 10444.6841981938. The cubic root of 109091428 is about 477.8191399241.

The spelling of 109091428 in words is "one hundred nine million, ninety-one thousand, four hundred twenty-eight".