531681 has 8 divisors (see below), whose sum is σ = 731904. Its totient is φ = 342960.

The previous prime is 531673. The next prime is 531689. The reversal of 531681 is 186135.

531681 = T₂₃₄ + T₂₃₅ + ... + T₂₅₁.

It is an interprime number because it is at equal distance from previous prime (531673) and next prime (531689).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 531681 - 2³ = 531673 is a prime.

It is a super-2 number, since 2×531681² = 565369371522, which contains 22 as substring.

It is a nialpdrome in base 14.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 531681.

It is not an unprimeable number, because it can be changed into a prime (531689) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2766 + ... + 2951.

It is an arithmetic number, because the mean of its divisors is an integer number (91488).

2⁵³¹⁶⁸¹ is an apocalyptic number.

It is an amenable number.

531681 is a deficient number, since it is larger than the sum of its proper divisors (200223).

531681 is a wasteful number, since it uses less digits than its factorization.

531681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5751.

The product of its digits is 720, while the sum is 24.

The square root of 531681 is about 729.1645904732. The cubic root of 531681 is about 81.0121914282.

The spelling of 531681 in words is "five hundred thirty-one thousand, six hundred eighty-one".