1525501172009 has 2 divisors, whose sum is σ = 1525501172010. Its totient is φ = 1525501172008.

The previous prime is 1525501171979. The next prime is 1525501172029. The reversal of 1525501172009 is 9002711055251.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1423599763609 + 101901408400 = 1193147^2 + 319220^2 .

It is a cyclic number.

It is not a de Polignac number, because 1525501172009 - 2³⁶ = 1456781695273 is a prime.

It is not a weakly prime, because it can be changed into another prime (1525501172029) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 762750586004 + 762750586005.

It is an arithmetic number, because the mean of its divisors is an integer number (762750586005).

Almost surely, 2^{1525501172009} is an apocalyptic number.

It is an amenable number.

1525501172009 is a deficient number, since it is larger than the sum of its proper divisors (1).

1525501172009 is an equidigital number, since it uses as much as digits as its factorization.

1525501172009 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 31500, while the sum is 38.

The spelling of 1525501172009 in words is "one trillion, five hundred twenty-five billion, five hundred one million, one hundred seventy-two thousand, nine".