145593421 has 2 divisors, whose sum is σ = 145593422. Its totient is φ = 145593420.

The previous prime is 145593407. The next prime is 145593433. The reversal of 145593421 is 124395541.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 78517321 + 67076100 = 8861^2 + 8190^2 .

It is a cyclic number.

It is not a de Polignac number, because 145593421 - 2⁷ = 145593293 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (145593121) 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, 72796710 + 72796711.

It is an arithmetic number, because the mean of its divisors is an integer number (72796711).

Almost surely, 2^145593421 is an apocalyptic number.

It is an amenable number.

145593421 is a deficient number, since it is larger than the sum of its proper divisors (1).

145593421 is an equidigital number, since it uses as much as digits as its factorization.

145593421 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 21600, while the sum is 34.

The square root of 145593421 is about 12066.2098854611. The cubic root of 145593421 is about 526.0744989826.

The spelling of 145593421 in words is "one hundred forty-five million, five hundred ninety-three thousand, four hundred twenty-one".