45165121 has 2 divisors, whose sum is σ = 45165122. Its totient is φ = 45165120.

The previous prime is 45165119. The next prime is 45165161. The reversal of 45165121 is 12156154.

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., 44289025 + 876096 = 6655^2 + 936^2 .

It is a cyclic number.

It is not a de Polignac number, because 45165121 - 2¹ = 45165119 is a prime.

Together with 45165119, it forms a pair of twin primes.

It is the 6721-st Hogben number.

It is not a weakly prime, because it can be changed into another prime (45165161) by changing a digit.

It is a nontrivial repunit in base 6720.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 22582560 + 22582561.

It is an arithmetic number, because the mean of its divisors is an integer number (22582561).

Almost surely, 2^45165121 is an apocalyptic number.

It is an amenable number.

45165121 is a deficient number, since it is larger than the sum of its proper divisors (1).

45165121 is an equidigital number, since it uses as much as digits as its factorization.

45165121 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1200, while the sum is 25.

The square root of 45165121 is about 6720.5000557994. The cubic root of 45165121 is about 356.1238496200.

The spelling of 45165121 in words is "forty-five million, one hundred sixty-five thousand, one hundred twenty-one".