145174993 has 2 divisors, whose sum is σ = 145174994. Its totient is φ = 145174992.

The previous prime is 145174979. The next prime is 145174999. The reversal of 145174993 is 399471541.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 97950609 + 47224384 = 9897^2 + 6872^2 .

It is a cyclic number.

It is not a de Polignac number, because 145174993 - 2⁵ = 145174961 is a prime.

It is not a weakly prime, because it can be changed into another prime (145174999) 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, 72587496 + 72587497.

It is an arithmetic number, because the mean of its divisors is an integer number (72587497).

Almost surely, 2^145174993 is an apocalyptic number.

It is an amenable number.

145174993 is a deficient number, since it is larger than the sum of its proper divisors (1).

145174993 is an equidigital number, since it uses as much as digits as its factorization.

145174993 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 136080, while the sum is 43.

The square root of 145174993 is about 12048.8585766453. The cubic root of 145174993 is about 525.5700450689.

The spelling of 145174993 in words is "one hundred forty-five million, one hundred seventy-four thousand, nine hundred ninety-three".