145474421 has 2 divisors, whose sum is σ = 145474422. Its totient is φ = 145474420.

The previous prime is 145474397. The next prime is 145474429. The reversal of 145474421 is 124474541.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 144240100 + 1234321 = 12010^2 + 1111^2 .

It is an emirp because it is prime and its reverse (124474541) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 145474421 - 2¹⁰ = 145473397 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (145474429) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 72737210 + 72737211.

It is an arithmetic number, because the mean of its divisors is an integer number (72737211).

Almost surely, 2^145474421 is an apocalyptic number.

It is an amenable number.

145474421 is a deficient number, since it is larger than the sum of its proper divisors (1).

145474421 is an equidigital number, since it uses as much as digits as its factorization.

145474421 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 17920, while the sum is 32.

The square root of 145474421 is about 12061.2777515485. The cubic root of 145474421 is about 525.9311318608.

The spelling of 145474421 in words is "one hundred forty-five million, four hundred seventy-four thousand, four hundred twenty-one".