129181537 has 2 divisors, whose sum is σ = 129181538. Its totient is φ = 129181536.

The previous prime is 129181531. The next prime is 129181553. The reversal of 129181537 is 735181921.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 125529616 + 3651921 = 11204^2 + 1911^2 .

It is a cyclic number.

It is not a de Polignac number, because 129181537 - 2¹¹ = 129179489 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 129181496 and 129181505.

It is not a weakly prime, because it can be changed into another prime (129181531) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64590768 + 64590769.

It is an arithmetic number, because the mean of its divisors is an integer number (64590769).

Almost surely, 2^129181537 is an apocalyptic number.

It is an amenable number.

129181537 is a deficient number, since it is larger than the sum of its proper divisors (1).

129181537 is an equidigital number, since it uses as much as digits as its factorization.

129181537 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 15120, while the sum is 37.

The square root of 129181537 is about 11365.8056027719. The cubic root of 129181537 is about 505.5143431329.

It can be divided in two parts, 1291 and 81537, that added together give a palindrome (82828).

The spelling of 129181537 in words is "one hundred twenty-nine million, one hundred eighty-one thousand, five hundred thirty-seven".