1520012173 has 2 divisors, whose sum is σ = 1520012174. Its totient is φ = 1520012172.

The previous prime is 1520012167. The next prime is 1520012191. The reversal of 1520012173 is 3712100251.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 811281289 + 708730884 = 28483^2 + 26622^2 .

It is an emirp because it is prime and its reverse (3712100251) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1520012173 - 2²⁹ = 983141261 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1520012113) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 760006086 + 760006087.

It is an arithmetic number, because the mean of its divisors is an integer number (760006087).

Almost surely, 2^1520012173 is an apocalyptic number.

It is an amenable number.

1520012173 is a deficient number, since it is larger than the sum of its proper divisors (1).

1520012173 is an equidigital number, since it uses as much as digits as its factorization.

1520012173 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 420, while the sum is 22.

The square root of 1520012173 is about 38987.3334943543. Note that the first 3 decimals coincide. The cubic root of 1520012173 is about 1149.7824851371.

The spelling of 1520012173 in words is "one billion, five hundred twenty million, twelve thousand, one hundred seventy-three".