145314821 has 2 divisors, whose sum is σ = 145314822. Its totient is φ = 145314820.

The previous prime is 145314803. The next prime is 145314847. The reversal of 145314821 is 128413541.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 140161921 + 5152900 = 11839^2 + 2270^2 .

It is a cyclic number.

It is not a de Polignac number, because 145314821 - 2¹⁴ = 145298437 is a prime.

It is a super-2 number, since 2×145314821² = 42232794404524082, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (141314821) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 72657410 + 72657411.

It is an arithmetic number, because the mean of its divisors is an integer number (72657411).

Almost surely, 2^145314821 is an apocalyptic number.

It is an amenable number.

145314821 is a deficient number, since it is larger than the sum of its proper divisors (1).

145314821 is an equidigital number, since it uses as much as digits as its factorization.

145314821 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3840, while the sum is 29.

The square root of 145314821 is about 12054.6597214521. The cubic root of 145314821 is about 525.7387284515.

The spelling of 145314821 in words is "one hundred forty-five million, three hundred fourteen thousand, eight hundred twenty-one".