1091601 has 12 divisors (see below), whose sum is σ = 1802112. Its totient is φ = 623736.

The previous prime is 1091591. The next prime is 1091609. The reversal of 1091601 is 1061901.

It is not a de Polignac number, because 1091601 - 2¹⁰ = 1090577 is a prime.

1091601 is a strobogrammatic number because it is the same when read upside-down.

It is not an unprimeable number, because it can be changed into a prime (1091609) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8601 + ... + 8726.

It is an arithmetic number, because the mean of its divisors is an integer number (150176).

2^1091601 is an apocalyptic number.

It is an amenable number.

1091601 is a deficient number, since it is larger than the sum of its proper divisors (710511).

1091601 is a wasteful number, since it uses less digits than its factorization.

1091601 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17340 (or 17337 counting only the distinct ones).

The product of its (nonzero) digits is 54, while the sum is 18.

The square root of 1091601 is about 1044.7971094906. The cubic root of 1091601 is about 102.9646090746.

The spelling of 1091601 in words is "one million, ninety-one thousand, six hundred one".