1561125 has 32 divisors (see below), whose sum is σ = 2725632. Its totient is φ = 792000.

The previous prime is 1561123. The next prime is 1561139. The reversal of 1561125 is 5211651.

1561125 = T₃₀ + T₃₁ + ... + T₂₁₀.

It is not a de Polignac number, because 1561125 - 2¹ = 1561123 is a prime.

It is a super-2 number, since 2×1561125² = 4874222531250, which contains 22 as substring.

1561125 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1561121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 8535 + ... + 8715.

It is an arithmetic number, because the mean of its divisors is an integer number (85176).

2^1561125 is an apocalyptic number.

1561125 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1561125 is a deficient number, since it is larger than the sum of its proper divisors (1164507).

1561125 is a wasteful number, since it uses less digits than its factorization.

1561125 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 222 (or 212 counting only the distinct ones).

The product of its digits is 300, while the sum is 21.

The square root of 1561125 is about 1249.4498789467. The cubic root of 1561125 is about 116.0056725327.

Adding to 1561125 its reverse (5211651), we get a palindrome (6772776).

The spelling of 1561125 in words is "one million, five hundred sixty-one thousand, one hundred twenty-five".