145847521 has 2 divisors, whose sum is σ = 145847522. Its totient is φ = 145847520.

The previous prime is 145847501. The next prime is 145847563. The reversal of 145847521 is 125748541.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 81270225 + 64577296 = 9015^2 + 8036^2 .

It is a cyclic number.

It is not a de Polignac number, because 145847521 - 2¹¹ = 145845473 is a prime.

It is not a weakly prime, because it can be changed into another prime (145847501) 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, 72923760 + 72923761.

It is an arithmetic number, because the mean of its divisors is an integer number (72923761).

Almost surely, 2^145847521 is an apocalyptic number.

It is an amenable number.

145847521 is a deficient number, since it is larger than the sum of its proper divisors (1).

145847521 is an equidigital number, since it uses as much as digits as its factorization.

145847521 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 44800, while the sum is 37.

The square root of 145847521 is about 12076.7346994128. The cubic root of 145847521 is about 526.3803686616.

The spelling of 145847521 in words is "one hundred forty-five million, eight hundred forty-seven thousand, five hundred twenty-one".