231532531 has 2 divisors, whose sum is σ = 231532532. Its totient is φ = 231532530.

The previous prime is 231532517. The next prime is 231532541. The reversal of 231532531 is 135235132.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 231532531 - 2⁷ = 231532403 is a prime.

It is a super-2 number, since 2×231532531² = 107214625822531922, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 231532496 and 231532505.

It is not a weakly prime, because it can be changed into another prime (231532541) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115766265 + 115766266.

It is an arithmetic number, because the mean of its divisors is an integer number (115766266).

Almost surely, 2^231532531 is an apocalyptic number.

231532531 is a deficient number, since it is larger than the sum of its proper divisors (1).

231532531 is an equidigital number, since it uses as much as digits as its factorization.

231532531 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2700, while the sum is 25.

The square root of 231532531 is about 15216.1930521402. The cubic root of 231532531 is about 614.0503827840.

Adding to 231532531 its reverse (135235132), we get a palindrome (366767663).

The spelling of 231532531 in words is "two hundred thirty-one million, five hundred thirty-two thousand, five hundred thirty-one".