145515973 has 2 divisors, whose sum is σ = 145515974. Its totient is φ = 145515972.

The previous prime is 145515949. The next prime is 145515977. The reversal of 145515973 is 379515541.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 145515969 + 4 = 12063^2 + 2^2 .

It is an emirp because it is prime and its reverse (379515541) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 145515973 - 2⁵ = 145515941 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (145515977) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 72757986 + 72757987.

It is an arithmetic number, because the mean of its divisors is an integer number (72757987).

Almost surely, 2^145515973 is an apocalyptic number.

It is an amenable number.

145515973 is a deficient number, since it is larger than the sum of its proper divisors (1).

145515973 is an equidigital number, since it uses as much as digits as its factorization.

145515973 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 94500, while the sum is 40.

The square root of 145515973 is about 12063.0001657962. Note that the first 3 decimals coincide. The cubic root of 145515973 is about 525.9812011671.

The spelling of 145515973 in words is "one hundred forty-five million, five hundred fifteen thousand, nine hundred seventy-three".