115431287 has 2 divisors, whose sum is σ = 115431288. Its totient is φ = 115431286.

The previous prime is 115431271. The next prime is 115431311. The reversal of 115431287 is 782134511.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 115431287 - 2⁴ = 115431271 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (115431187) 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, 57715643 + 57715644.

It is an arithmetic number, because the mean of its divisors is an integer number (57715644).

Almost surely, 2^115431287 is an apocalyptic number.

115431287 is a deficient number, since it is larger than the sum of its proper divisors (1).

115431287 is an equidigital number, since it uses as much as digits as its factorization.

115431287 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6720, while the sum is 32.

The square root of 115431287 is about 10743.8953364224. The cubic root of 115431287 is about 486.9015748932.

Adding to 115431287 its reverse (782134511), we get a palindrome (897565798).

It can be divided in two parts, 11543 and 1287, that multiplied together give a palindrome (14855841).

The spelling of 115431287 in words is "one hundred fifteen million, four hundred thirty-one thousand, two hundred eighty-seven".