145660391 has 2 divisors, whose sum is σ = 145660392. Its totient is φ = 145660390.

The previous prime is 145660363. The next prime is 145660397. The reversal of 145660391 is 193066541.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 145660391 - 2¹⁴ = 145644007 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (145660397) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 72830195 + 72830196.

It is an arithmetic number, because the mean of its divisors is an integer number (72830196).

Almost surely, 2^145660391 is an apocalyptic number.

145660391 is a deficient number, since it is larger than the sum of its proper divisors (1).

145660391 is an equidigital number, since it uses as much as digits as its factorization.

145660391 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 19440, while the sum is 35.

The square root of 145660391 is about 12068.9846714626. The cubic root of 145660391 is about 526.1551477932.

The spelling of 145660391 in words is "one hundred forty-five million, six hundred sixty thousand, three hundred ninety-one".