239152391521 has 2 divisors, whose sum is σ = 239152391522. Its totient is φ = 239152391520.

The previous prime is 239152391507. The next prime is 239152391531. The reversal of 239152391521 is 125193251932.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 132834007296 + 106318384225 = 364464^2 + 326065^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-239152391521 is a prime.

It is not a weakly prime, because it can be changed into another prime (239152391501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 119576195760 + 119576195761.

It is an arithmetic number, because the mean of its divisors is an integer number (119576195761).

Almost surely, 2^239152391521 is an apocalyptic number.

It is an amenable number.

239152391521 is a deficient number, since it is larger than the sum of its proper divisors (1).

239152391521 is an equidigital number, since it uses as much as digits as its factorization.

239152391521 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 145800, while the sum is 43.

The spelling of 239152391521 in words is "two hundred thirty-nine billion, one hundred fifty-two million, three hundred ninety-one thousand, five hundred twenty-one".