145520431393 has 2 divisors, whose sum is σ = 145520431394. Its totient is φ = 145520431392.

The previous prime is 145520431321. The next prime is 145520431447. The reversal of 145520431393 is 393134025541.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 145514020369 + 6411024 = 381463^2 + 2532^2 .

It is a cyclic number.

It is not a de Polignac number, because 145520431393 - 2¹³ = 145520423201 is a prime.

It is not a weakly prime, because it can be changed into another prime (145520431093) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 72760215696 + 72760215697.

It is an arithmetic number, because the mean of its divisors is an integer number (72760215697).

Almost surely, 2^145520431393 is an apocalyptic number.

It is an amenable number.

145520431393 is a deficient number, since it is larger than the sum of its proper divisors (1).

145520431393 is an equidigital number, since it uses as much as digits as its factorization.

145520431393 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 194400, while the sum is 40.

The spelling of 145520431393 in words is "one hundred forty-five billion, five hundred twenty million, four hundred thirty-one thousand, three hundred ninety-three".