145418521 has 2 divisors, whose sum is σ = 145418522. Its totient is φ = 145418520.

The previous prime is 145418519. The next prime is 145418543. The reversal of 145418521 is 125814541.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 88566921 + 56851600 = 9411^2 + 7540^2 .

It is a cyclic number.

It is not a de Polignac number, because 145418521 - 2¹ = 145418519 is a prime.

It is a super-2 number, since 2×145418521² = 42293092499654882, which contains 22 as substring.

Together with 145418519, it forms a pair of twin primes.

It is an alternating number because its digits alternate between odd and even.

It is not a weakly prime, because it can be changed into another prime (145418921) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 72709260 + 72709261.

It is an arithmetic number, because the mean of its divisors is an integer number (72709261).

Almost surely, 2^145418521 is an apocalyptic number.

It is an amenable number.

145418521 is a deficient number, since it is larger than the sum of its proper divisors (1).

145418521 is an equidigital number, since it uses as much as digits as its factorization.

145418521 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6400, while the sum is 31.

The square root of 145418521 is about 12058.9601956388. The cubic root of 145418521 is about 525.8637584661.

The spelling of 145418521 in words is "one hundred forty-five million, four hundred eighteen thousand, five hundred twenty-one".