231542761 has 2 divisors, whose sum is σ = 231542762. Its totient is φ = 231542760.

The previous prime is 231542747. The next prime is 231542807. The reversal of 231542761 is 167245132.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 216090000 + 15452761 = 14700^2 + 3931^2 .

It is a cyclic number.

It is not a de Polignac number, because 231542761 - 2¹¹ = 231540713 is a prime.

It is a super-2 number, since 2×231542761² = 107224100343006242, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (231542711) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115771380 + 115771381.

It is an arithmetic number, because the mean of its divisors is an integer number (115771381).

Almost surely, 2^231542761 is an apocalyptic number.

It is an amenable number.

231542761 is a deficient number, since it is larger than the sum of its proper divisors (1).

231542761 is an equidigital number, since it uses as much as digits as its factorization.

231542761 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10080, while the sum is 31.

The square root of 231542761 is about 15216.5292034682. The cubic root of 231542761 is about 614.0594263553.

Adding to 231542761 its reverse (167245132), we get a palindrome (398787893).

The spelling of 231542761 in words is "two hundred thirty-one million, five hundred forty-two thousand, seven hundred sixty-one".