1691055 has 12 divisors (see below), whose sum is σ = 2931240. Its totient is φ = 901872.

The previous prime is 1691051. The next prime is 1691069. The reversal of 1691055 is 5501961.

It is not a de Polignac number, because 1691055 - 2² = 1691051 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1691051) 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, 18745 + ... + 18834.

It is an arithmetic number, because the mean of its divisors is an integer number (244270).

2^1691055 is an apocalyptic number.

1691055 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1691055 is a deficient number, since it is larger than the sum of its proper divisors (1240185).

1691055 is a wasteful number, since it uses less digits than its factorization.

1691055 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37590 (or 37587 counting only the distinct ones).

The product of its (nonzero) digits is 1350, while the sum is 27.

The square root of 1691055 is about 1300.4057059241. The cubic root of 1691055 is about 119.1386233803.

The spelling of 1691055 in words is "one million, six hundred ninety-one thousand, fifty-five".