145145591 has 2 divisors, whose sum is σ = 145145592. Its totient is φ = 145145590.

The previous prime is 145145573. The next prime is 145145593. The reversal of 145145591 is 195541541.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 145145591 - 2¹⁸ = 144883447 is a prime.

Together with 145145593, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (145145593) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 72572795 + 72572796.

It is an arithmetic number, because the mean of its divisors is an integer number (72572796).

Almost surely, 2^145145591 is an apocalyptic number.

145145591 is a deficient number, since it is larger than the sum of its proper divisors (1).

145145591 is an equidigital number, since it uses as much as digits as its factorization.

145145591 is an evil number, because the sum of its binary digits is even.

The product of its digits is 18000, while the sum is 35.

The square root of 145145591 is about 12047.6383992881. The cubic root of 145145591 is about 525.5345617912.

The spelling of 145145591 in words is "one hundred forty-five million, one hundred forty-five thousand, five hundred ninety-one".