145238729 has 2 divisors, whose sum is σ = 145238730. Its totient is φ = 145238728.

The previous prime is 145238677. The next prime is 145238747. The reversal of 145238729 is 927832541.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 76597504 + 68641225 = 8752^2 + 8285^2 .

It is an emirp because it is prime and its reverse (927832541) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 145238729 - 2²⁴ = 128461513 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is not a weakly prime, because it can be changed into another prime (145238759) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 72619364 + 72619365.

It is an arithmetic number, because the mean of its divisors is an integer number (72619365).

Almost surely, 2^145238729 is an apocalyptic number.

It is an amenable number.

145238729 is a deficient number, since it is larger than the sum of its proper divisors (1).

145238729 is an equidigital number, since it uses as much as digits as its factorization.

145238729 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 120960, while the sum is 41.

The square root of 145238729 is about 12051.5031842505. The cubic root of 145238729 is about 525.6469472744.

The spelling of 145238729 in words is "one hundred forty-five million, two hundred thirty-eight thousand, seven hundred twenty-nine".