531661031 has 32 divisors (see below), whose sum is σ = 630789120. Its totient is φ = 443027200.

The previous prime is 531661027. The next prime is 531661049. The reversal of 531661031 is 130166135.

It is not a de Polignac number, because 531661031 - 2² = 531661027 is a prime.

It is a super-2 number, since 2×531661031² = 565326903767965922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (531661001) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1709366 + ... + 1709676.

It is an arithmetic number, because the mean of its divisors is an integer number (19712160).

Almost surely, 2^531661031 is an apocalyptic number.

531661031 is a deficient number, since it is larger than the sum of its proper divisors (99128089).

531661031 is a wasteful number, since it uses less digits than its factorization.

531661031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 607.

The product of its (nonzero) digits is 1620, while the sum is 26.

The square root of 531661031 is about 23057.7759335110. The cubic root of 531661031 is about 810.1117719051. Note that the first 3 decimals are identical.

The spelling of 531661031 in words is "five hundred thirty-one million, six hundred sixty-one thousand, thirty-one".