145405213 has 2 divisors, whose sum is σ = 145405214. Its totient is φ = 145405212.

The previous prime is 145405193. The next prime is 145405223. The reversal of 145405213 is 312504541.

It is a happy number.

145405213 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., 124947684 + 20457529 = 11178^2 + 4523^2 .

It is an emirp because it is prime and its reverse (312504541) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-145405213 is a prime.

It is a super-2 number, since 2×145405213² = 42285351935150738, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (145405223) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 72702606 + 72702607.

It is an arithmetic number, because the mean of its divisors is an integer number (72702607).

Almost surely, 2^145405213 is an apocalyptic number.

It is an amenable number.

145405213 is a deficient number, since it is larger than the sum of its proper divisors (1).

145405213 is an equidigital number, since it uses as much as digits as its factorization.

145405213 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2400, while the sum is 25.

The square root of 145405213 is about 12058.4083941456. The cubic root of 145405213 is about 525.8477164738.

Adding to 145405213 its reverse (312504541), we get a palindrome (457909754).

The spelling of 145405213 in words is "one hundred forty-five million, four hundred five thousand, two hundred thirteen".