1055561 has 4 divisors (see below), whose sum is σ = 1136772. Its totient is φ = 974352.

The previous prime is 1055543. The next prime is 1055567. The reversal of 1055561 is 1655501.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1655501 = 1087 ⋅1523.

It can be written as a sum of positive squares in 2 ways, for example, as 383161 + 672400 = 619^2 + 820^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1055561 is a prime.

It is a super-2 number, since 2×1055561² = 2228418049442, which contains 22 as substring.

It is an Ulam number.

It is not an unprimeable number, because it can be changed into a prime (1055567) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 40586 + ... + 40611.

It is an arithmetic number, because the mean of its divisors is an integer number (284193).

2^1055561 is an apocalyptic number.

It is an amenable number.

1055561 is a deficient number, since it is larger than the sum of its proper divisors (81211).

1055561 is an equidigital number, since it uses as much as digits as its factorization.

1055561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81210.

The product of its (nonzero) digits is 750, while the sum is 23.

The square root of 1055561 is about 1027.4049834413. The cubic root of 1055561 is about 101.8187541277.

The spelling of 1055561 in words is "one million, fifty-five thousand, five hundred sixty-one".