1561023 has 12 divisors (see below), whose sum is σ = 2277288. Its totient is φ = 1030320.

The previous prime is 1561019. The next prime is 1561037. The reversal of 1561023 is 3201651.

It is not a de Polignac number, because 1561023 - 2² = 1561019 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1560987 and 1561005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1561003) 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, 153 + ... + 1773.

It is an arithmetic number, because the mean of its divisors is an integer number (189774).

2^1561023 is an apocalyptic number.

1561023 is a deficient number, since it is larger than the sum of its proper divisors (716265).

1561023 is a wasteful number, since it uses less digits than its factorization.

1561023 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1734 (or 1731 counting only the distinct ones).

The product of its (nonzero) digits is 180, while the sum is 18.

The square root of 1561023 is about 1249.4090603161. The cubic root of 1561023 is about 116.0031459710.

Adding to 1561023 its reverse (3201651), we get a palindrome (4762674).

The spelling of 1561023 in words is "one million, five hundred sixty-one thousand, twenty-three".