145721593 has 2 divisors, whose sum is σ = 145721594. Its totient is φ = 145721592.

The previous prime is 145721581. The next prime is 145721599. The reversal of 145721593 is 395127541.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 99440784 + 46280809 = 9972^2 + 6803^2 .

It is an emirp because it is prime and its reverse (395127541) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 145721593 - 2⁵ = 145721561 is a prime.

It is not a weakly prime, because it can be changed into another prime (145721599) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 72860796 + 72860797.

It is an arithmetic number, because the mean of its divisors is an integer number (72860797).

Almost surely, 2^145721593 is an apocalyptic number.

It is an amenable number.

145721593 is a deficient number, since it is larger than the sum of its proper divisors (1).

145721593 is an equidigital number, since it uses as much as digits as its factorization.

145721593 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 37800, while the sum is 37.

The square root of 145721593 is about 12071.5199125876. The cubic root of 145721593 is about 526.2288288585.

The spelling of 145721593 in words is "one hundred forty-five million, seven hundred twenty-one thousand, five hundred ninety-three".