145512121 has 2 divisors, whose sum is σ = 145512122. Its totient is φ = 145512120.

The previous prime is 145512097. The next prime is 145512137. The reversal of 145512121 is 121215541.

145512121 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 138415225 + 7096896 = 11765^2 + 2664^2 .

It is an emirp because it is prime and its reverse (121215541) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 145512121 - 2²¹ = 143414969 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 145512092 and 145512101.

It is not a weakly prime, because it can be changed into another prime (145512151) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 72756060 + 72756061.

It is an arithmetic number, because the mean of its divisors is an integer number (72756061).

Almost surely, 2^145512121 is an apocalyptic number.

It is an amenable number.

145512121 is a deficient number, since it is larger than the sum of its proper divisors (1).

145512121 is an equidigital number, since it uses as much as digits as its factorization.

145512121 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 145512121 is about 12062.8405029661. The cubic root of 145512121 is about 525.9765599871.

Adding to 145512121 its reverse (121215541), we get a palindrome (266727662).

The spelling of 145512121 in words is "one hundred forty-five million, five hundred twelve thousand, one hundred twenty-one".