145440621 has 6 divisors (see below), whose sum is σ = 210080910. Its totient is φ = 96960408.

The previous prime is 145440619. The next prime is 145440629. The reversal of 145440621 is 126044541.

It can be written as a sum of positive squares in only one way, i.e., 80460900 + 64979721 = 8970^2 + 8061^2 .

It is not a de Polignac number, because 145440621 - 2¹ = 145440619 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (145440629) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 8080026 + ... + 8080043.

It is an arithmetic number, because the mean of its divisors is an integer number (35013485).

Almost surely, 2^145440621 is an apocalyptic number.

It is an amenable number.

145440621 is a deficient number, since it is larger than the sum of its proper divisors (64640289).

145440621 is a wasteful number, since it uses less digits than its factorization.

145440621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16160075 (or 16160072 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 27.

The square root of 145440621 is about 12059.8764919049. The cubic root of 145440621 is about 525.8903965227.

The spelling of 145440621 in words is "one hundred forty-five million, four hundred forty thousand, six hundred twenty-one".