45155021 has 2 divisors, whose sum is σ = 45155022. Its totient is φ = 45155020.

The previous prime is 45155017. The next prime is 45155041. The reversal of 45155021 is 12055154.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 37393225 + 7761796 = 6115^2 + 2786^2 .

It is a cyclic number.

It is not a de Polignac number, because 45155021 - 2² = 45155017 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (45155041) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 22577510 + 22577511.

It is an arithmetic number, because the mean of its divisors is an integer number (22577511).

Almost surely, 2^45155021 is an apocalyptic number.

It is an amenable number.

45155021 is a deficient number, since it is larger than the sum of its proper divisors (1).

45155021 is an equidigital number, since it uses as much as digits as its factorization.

45155021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1000, while the sum is 23.

The square root of 45155021 is about 6719.7485816063. The cubic root of 45155021 is about 356.0973017076.

The spelling of 45155021 in words is "forty-five million, one hundred fifty-five thousand, twenty-one".