145451021 has 2 divisors, whose sum is σ = 145451022. Its totient is φ = 145451020.

The previous prime is 145450937. The next prime is 145451077. The reversal of 145451021 is 120154541.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 120340900 + 25110121 = 10970^2 + 5011^2 .

It is a cyclic number.

It is not a de Polignac number, because 145451021 - 2¹⁴ = 145434637 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (145451221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 72725510 + 72725511.

It is an arithmetic number, because the mean of its divisors is an integer number (72725511).

Almost surely, 2^145451021 is an apocalyptic number.

It is an amenable number.

145451021 is a deficient number, since it is larger than the sum of its proper divisors (1).

145451021 is an equidigital number, since it uses as much as digits as its factorization.

145451021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 800, while the sum is 23.

The square root of 145451021 is about 12060.3076660589. The cubic root of 145451021 is about 525.9029311450.

The spelling of 145451021 in words is "one hundred forty-five million, four hundred fifty-one thousand, twenty-one".