1547561 has 4 divisors (see below), whose sum is σ = 1638612. Its totient is φ = 1456512.

The previous prime is 1547543. The next prime is 1547563. The reversal of 1547561 is 1657451.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1210000 + 337561 = 1100^2 + 581^2 .

It is a cyclic number.

It is not a de Polignac number, because 1547561 - 2¹⁰ = 1546537 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1547563) 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, 45500 + ... + 45533.

It is an arithmetic number, because the mean of its divisors is an integer number (409653).

2^1547561 is an apocalyptic number.

It is an amenable number.

1547561 is a deficient number, since it is larger than the sum of its proper divisors (91051).

1547561 is an equidigital number, since it uses as much as digits as its factorization.

It is an anagram of its base 8 representation: 1547561 = (5716451)₈.

1547561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 91050.

The product of its digits is 4200, while the sum is 29.

The square root of 1547561 is about 1244.0100481909. The cubic root of 1547561 is about 115.6687188947.

It can be divided in two parts, 15 and 47561, that multiplied together give a triangular number (713415 = T₁₁₉₄).

The spelling of 1547561 in words is "one million, five hundred forty-seven thousand, five hundred sixty-one".