1545561 has 10 divisors (see below), whose sum is σ = 2308922. Its totient is φ = 1030320.

The previous prime is 1545553. The next prime is 1545563. The reversal of 1545561 is 1655451.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 1089936 + 455625 = 1044^2 + 675^2 .

It is not a de Polignac number, because 1545561 - 2³ = 1545553 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1545563) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 9460 + ... + 9621.

2^1545561 is an apocalyptic number.

It is an amenable number.

1545561 is a deficient number, since it is larger than the sum of its proper divisors (763361).

1545561 is an equidigital number, since it uses as much as digits as its factorization.

1545561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19093 (or 19084 counting only the distinct ones).

The product of its digits is 3000, while the sum is 27.

The square root of 1545561 is about 1243.2059362793. The cubic root of 1545561 is about 115.6188690199.

The spelling of 1545561 in words is "one million, five hundred forty-five thousand, five hundred sixty-one".