145459021 has 16 divisors (see below), whose sum is σ = 158781168. Its totient is φ = 132710400.

The previous prime is 145459007. The next prime is 145459057. The reversal of 145459021 is 120954541.

145459021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 8 ways, for example, as 14356521 + 131102500 = 3789^2 + 11450^2 .

It is a 8-Lehmer number, since φ(145459021) divides (145459021-1)⁸.

It is a cyclic number.

It is not a de Polignac number, because 145459021 - 2⁷ = 145458893 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (145459001) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 125581 + ... + 126733.

It is an arithmetic number, because the mean of its divisors is an integer number (9923823).

Almost surely, 2^145459021 is an apocalyptic number.

It is an amenable number.

145459021 is a deficient number, since it is larger than the sum of its proper divisors (13322147).

145459021 is a wasteful number, since it uses less digits than its factorization.

145459021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1392.

The product of its (nonzero) digits is 7200, while the sum is 31.

The square root of 145459021 is about 12060.6393279958. The cubic root of 145459021 is about 525.9125727556.

The spelling of 145459021 in words is "one hundred forty-five million, four hundred fifty-nine thousand, twenty-one".