1055691 has 24 divisors (see below), whose sum is σ = 1878240. Its totient is φ = 556416.

The previous prime is 1055689. The next prime is 1055713. The reversal of 1055691 is 1965501.

It is not a de Polignac number, because 1055691 - 2¹ = 1055689 is a prime.

It is a super-2 number, since 2×1055691² = 2228966974962, which contains 22 as substring.

1055691 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (1055611) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 175 + ... + 1463.

It is an arithmetic number, because the mean of its divisors is an integer number (78260).

2^1055691 is an apocalyptic number.

1055691 is a deficient number, since it is larger than the sum of its proper divisors (822549).

1055691 is a wasteful number, since it uses less digits than its factorization.

1055691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1315 (or 1312 counting only the distinct ones).

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

The square root of 1055691 is about 1027.4682476846. The cubic root of 1055691 is about 101.8229338624.

It can be divided in two parts, 105569 and 1, that added together give a triangular number (105570 = T₄₅₉).

The spelling of 1055691 in words is "one million, fifty-five thousand, six hundred ninety-one".