531355681 has 4 divisors (see below), whose sum is σ = 535539712. Its totient is φ = 527171652.

The previous prime is 531355663. The next prime is 531355751. The reversal of 531355681 is 186553135.

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 531355681 - 2¹³ = 531347489 is a prime.

It is a super-2 number, since 2×531355681² = 564677719461947522, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 531355681.

It is not an unprimeable number, because it can be changed into a prime (531355381) 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, 2091825 + ... + 2092078.

It is an arithmetic number, because the mean of its divisors is an integer number (133884928).

Almost surely, 2^531355681 is an apocalyptic number.

It is an amenable number.

531355681 is a deficient number, since it is larger than the sum of its proper divisors (4184031).

531355681 is a wasteful number, since it uses less digits than its factorization.

531355681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4184030.

The product of its digits is 54000, while the sum is 37.

The square root of 531355681 is about 23051.1535720016. The cubic root of 531355681 is about 809.9566511374.

The spelling of 531355681 in words is "five hundred thirty-one million, three hundred fifty-five thousand, six hundred eighty-one".