145555591 has 2 divisors, whose sum is σ = 145555592. Its totient is φ = 145555590.

The previous prime is 145555511. The next prime is 145555603. The reversal of 145555591 is 195555541.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 145555591 - 2⁷ = 145555463 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (145555511) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 72777795 + 72777796.

It is an arithmetic number, because the mean of its divisors is an integer number (72777796).

Almost surely, 2^145555591 is an apocalyptic number.

145555591 is a deficient number, since it is larger than the sum of its proper divisors (1).

145555591 is an equidigital number, since it uses as much as digits as its factorization.

145555591 is an evil number, because the sum of its binary digits is even.

The product of its digits is 112500, while the sum is 40.

The square root of 145555591 is about 12064.6421828416. The cubic root of 145555591 is about 526.0289311676.

The spelling of 145555591 in words is "one hundred forty-five million, five hundred fifty-five thousand, five hundred ninety-one".