1513681 has 4 divisors (see below), whose sum is σ = 1630132. Its totient is φ = 1397232.

The previous prime is 1513669. The next prime is 1513693. The reversal of 1513681 is 1863151.

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

It is an interprime number because it is at equal distance from previous prime (1513669) and next prime (1513693).

It can be written as a sum of positive squares in 2 ways, for example, as 379456 + 1134225 = 616^2 + 1065^2 .

It is a cyclic number.

It is not a de Polignac number, because 1513681 - 2⁷ = 1513553 is a prime.

It is a super-2 number, since 2×1513681² = 4582460339522, which contains 22 as substring.

It is a Duffinian number.

1513681 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (1513601) 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, 58206 + ... + 58231.

It is an arithmetic number, because the mean of its divisors is an integer number (407533).

2^1513681 is an apocalyptic number.

It is an amenable number.

1513681 is a deficient number, since it is larger than the sum of its proper divisors (116451).

1513681 is a wasteful number, since it uses less digits than its factorization.

1513681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 116450.

The product of its digits is 720, while the sum is 25.

The square root of 1513681 is about 1230.3174387125. The cubic root of 1513681 is about 114.8183900982.

The spelling of 1513681 in words is "one million, five hundred thirteen thousand, six hundred eighty-one".