145021771 has 2 divisors, whose sum is σ = 145021772. Its totient is φ = 145021770.

The previous prime is 145021769. The next prime is 145021787. The reversal of 145021771 is 177120541.

145021771 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 145021771 - 2¹ = 145021769 is a prime.

Together with 145021769, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (145021711) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 72510885 + 72510886.

It is an arithmetic number, because the mean of its divisors is an integer number (72510886).

Almost surely, 2^145021771 is an apocalyptic number.

145021771 is a deficient number, since it is larger than the sum of its proper divisors (1).

145021771 is an equidigital number, since it uses as much as digits as its factorization.

145021771 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1960, while the sum is 28.

The square root of 145021771 is about 12042.4985364334. The cubic root of 145021771 is about 525.3850792350.

The spelling of 145021771 in words is "one hundred forty-five million, twenty-one thousand, seven hundred seventy-one".