145170391 has 2 divisors, whose sum is σ = 145170392. Its totient is φ = 145170390.

The previous prime is 145170379. The next prime is 145170397. The reversal of 145170391 is 193071541.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 145170391 - 2¹⁵ = 145137623 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (145170397) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 72585195 + 72585196.

It is an arithmetic number, because the mean of its divisors is an integer number (72585196).

Almost surely, 2^145170391 is an apocalyptic number.

145170391 is a deficient number, since it is larger than the sum of its proper divisors (1).

145170391 is an equidigital number, since it uses as much as digits as its factorization.

145170391 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3780, while the sum is 31.

The square root of 145170391 is about 12048.6676026854. The cubic root of 145170391 is about 525.5644915438.

The spelling of 145170391 in words is "one hundred forty-five million, one hundred seventy thousand, three hundred ninety-one".