231242537 has 2 divisors, whose sum is σ = 231242538. Its totient is φ = 231242536.

The previous prime is 231242513. The next prime is 231242569. The reversal of 231242537 is 735242132.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 149719696 + 81522841 = 12236^2 + 9029^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-231242537 is a prime.

It is a super-2 number, since 2×231242537² = 106946221836392738, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (231242507) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115621268 + 115621269.

It is an arithmetic number, because the mean of its divisors is an integer number (115621269).

Almost surely, 2^231242537 is an apocalyptic number.

It is an amenable number.

231242537 is a deficient number, since it is larger than the sum of its proper divisors (1).

231242537 is an equidigital number, since it uses as much as digits as its factorization.

231242537 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10080, while the sum is 29.

The square root of 231242537 is about 15206.6609418373. The cubic root of 231242537 is about 613.7939100798.

Adding to 231242537 its reverse (735242132), we get a palindrome (966484669).

The spelling of 231242537 in words is "two hundred thirty-one million, two hundred forty-two thousand, five hundred thirty-seven".