913681 has 4 divisors (see below), whose sum is σ = 915952. Its totient is φ = 911412.

The previous prime is 913639. The next prime is 913687. The reversal of 913681 is 186319.

It is a happy number.

913681 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 913681 - 2¹¹ = 911633 is a prime.

It is a super-2 number, since 2×913681² = 1669625939522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (913687) 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, 351 + ... + 1396.

It is an arithmetic number, because the mean of its divisors is an integer number (228988).

2⁹¹³⁶⁸¹ is an apocalyptic number.

It is an amenable number.

913681 is a deficient number, since it is larger than the sum of its proper divisors (2271).

913681 is a wasteful number, since it uses less digits than its factorization.

913681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2270.

The product of its digits is 1296, while the sum is 28.

The square root of 913681 is about 955.8666224950. The cubic root of 913681 is about 97.0356973512.

It can be divided in two parts, 91 and 3681, that multiplied together give a triangular number (334971 = T₈₁₈).

The spelling of 913681 in words is "nine hundred thirteen thousand, six hundred eighty-one".