1091421386 has 16 divisors (see below), whose sum is σ = 1891019520. Its totient is φ = 466918080.

The previous prime is 1091421379. The next prime is 1091421407. The reversal of 1091421386 is 6831241901.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1458746 + ... + 1459493.

It is an arithmetic number, because the mean of its divisors is an integer number (118188720).

Almost surely, 2^1091421386 is an apocalyptic number.

1091421386 is a deficient number, since it is larger than the sum of its proper divisors (799598134).

1091421386 is a wasteful number, since it uses less digits than its factorization.

1091421386 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2918269.

The product of its (nonzero) digits is 10368, while the sum is 35.

The square root of 1091421386 is about 33036.6672955975. The cubic root of 1091421386 is about 1029.5896143722.

The spelling of 1091421386 in words is "one billion, ninety-one million, four hundred twenty-one thousand, three hundred eighty-six".