1578161 has 16 divisors (see below), whose sum is σ = 1857744. Its totient is φ = 1327104.

The previous prime is 1578133. The next prime is 1578169. The reversal of 1578161 is 1618751.

It can be written as a sum of positive squares in 8 ways, for example, as 3136 + 1575025 = 56^2 + 1255^2 .

It is a cyclic number.

It is not a de Polignac number, because 1578161 - 2¹⁰ = 1577137 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 11.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1578169) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8081 + ... + 8273.

It is an arithmetic number, because the mean of its divisors is an integer number (116109).

2^1578161 is an apocalyptic number.

It is an amenable number.

1578161 is a deficient number, since it is larger than the sum of its proper divisors (279583).

1578161 is a wasteful number, since it uses less digits than its factorization.

1578161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 260.

The product of its digits is 1680, while the sum is 29.

The square root of 1578161 is about 1256.2487810939. The cubic root of 1578161 is about 116.4261229813.

The spelling of 1578161 in words is "one million, five hundred seventy-eight thousand, one hundred sixty-one".