1573681 has 4 divisors (see below), whose sum is σ = 1589364. Its totient is φ = 1558000.

The previous prime is 1573679. The next prime is 1573699. The reversal of 1573681 is 1863751.

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 1083681 + 490000 = 1041^2 + 700^2 .

It is a cyclic number.

It is not a de Polignac number, because 1573681 - 2¹ = 1573679 is a prime.

It is a super-2 number, since 2×1573681² = 4952943779522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1573651) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7690 + ... + 7891.

It is an arithmetic number, because the mean of its divisors is an integer number (397341).

2^1573681 is an apocalyptic number.

It is an amenable number.

1573681 is a deficient number, since it is larger than the sum of its proper divisors (15683).

1573681 is a wasteful number, since it uses less digits than its factorization.

1573681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15682.

The product of its digits is 5040, while the sum is 31.

The square root of 1573681 is about 1254.4644275546. The cubic root of 1573681 is about 116.3158504628.

The spelling of 1573681 in words is "one million, five hundred seventy-three thousand, six hundred eighty-one".