145445821 has 2 divisors, whose sum is σ = 145445822. Its totient is φ = 145445820.

The previous prime is 145445753. The next prime is 145445827. The reversal of 145445821 is 128544541.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 91584900 + 53860921 = 9570^2 + 7339^2 .

It is a cyclic number.

It is not a de Polignac number, because 145445821 - 2⁹ = 145445309 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (145445827) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 72722910 + 72722911.

It is an arithmetic number, because the mean of its divisors is an integer number (72722911).

Almost surely, 2^145445821 is an apocalyptic number.

It is an amenable number.

145445821 is a deficient number, since it is larger than the sum of its proper divisors (1).

145445821 is an equidigital number, since it uses as much as digits as its factorization.

145445821 is an evil number, because the sum of its binary digits is even.

The product of its digits is 25600, while the sum is 34.

The square root of 145445821 is about 12060.0920809088. The cubic root of 145445821 is about 525.8966639085.

The spelling of 145445821 in words is "one hundred forty-five million, four hundred forty-five thousand, eight hundred twenty-one".