145591493 has 2 divisors, whose sum is σ = 145591494. Its totient is φ = 145591492.

The previous prime is 145591489. The next prime is 145591499. The reversal of 145591493 is 394195541.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 119202724 + 26388769 = 10918^2 + 5137^2 .

It is a cyclic number.

It is not a de Polignac number, because 145591493 - 2² = 145591489 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 145591493.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (145591499) 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, 72795746 + 72795747.

It is an arithmetic number, because the mean of its divisors is an integer number (72795747).

Almost surely, 2^145591493 is an apocalyptic number.

It is an amenable number.

145591493 is a deficient number, since it is larger than the sum of its proper divisors (1).

145591493 is an equidigital number, since it uses as much as digits as its factorization.

145591493 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 97200, while the sum is 41.

The square root of 145591493 is about 12066.1299926696. The cubic root of 145591493 is about 526.0721768170.

The spelling of 145591493 in words is "one hundred forty-five million, five hundred ninety-one thousand, four hundred ninety-three".