145121521 has 2 divisors, whose sum is σ = 145121522. Its totient is φ = 145121520.

The previous prime is 145121491. The next prime is 145121567. The reversal of 145121521 is 125121541.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 94867600 + 50253921 = 9740^2 + 7089^2 .

It is a cyclic number.

It is not a de Polignac number, because 145121521 - 2⁵ = 145121489 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 145121492 and 145121501.

It is not a weakly prime, because it can be changed into another prime (145121621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 72560760 + 72560761.

It is an arithmetic number, because the mean of its divisors is an integer number (72560761).

Almost surely, 2^145121521 is an apocalyptic number.

It is an amenable number.

145121521 is a deficient number, since it is larger than the sum of its proper divisors (1).

145121521 is an equidigital number, since it uses as much as digits as its factorization.

145121521 is an evil number, because the sum of its binary digits is even.

The product of its digits is 400, while the sum is 22.

The square root of 145121521 is about 12046.6394069051. The cubic root of 145121521 is about 525.5055097749.

The spelling of 145121521 in words is "one hundred forty-five million, one hundred twenty-one thousand, five hundred twenty-one".