1561473 has 6 divisors (see below), whose sum is σ = 2255474. Its totient is φ = 1040976.

The previous prime is 1561463. The next prime is 1561499. The reversal of 1561473 is 3741651.

It can be written as a sum of positive squares in only one way, i.e., 1557504 + 3969 = 1248^2 + 63^2 .

It is not a de Polignac number, because 1561473 - 2⁴ = 1561457 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1561423) 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 5 ways as a sum of consecutive naturals, for example, 86740 + ... + 86757.

2^1561473 is an apocalyptic number.

It is an amenable number.

1561473 is a deficient number, since it is larger than the sum of its proper divisors (694001).

1561473 is a wasteful number, since it uses less digits than its factorization.

1561473 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 173503 (or 173500 counting only the distinct ones).

The product of its digits is 2520, while the sum is 27.

The square root of 1561473 is about 1249.5891324752. The cubic root of 1561473 is about 116.0142917389.

The spelling of 1561473 in words is "one million, five hundred sixty-one thousand, four hundred seventy-three".