145553213 has 4 divisors (see below), whose sum is σ = 156749628. Its totient is φ = 134356800.

The previous prime is 145553209. The next prime is 145553249. The reversal of 145553213 is 312355541.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 312355541 = 67 ⋅4662023.

It can be written as a sum of positive squares in 2 ways, for example, as 36517849 + 109035364 = 6043^2 + 10442^2 .

It is a cyclic number.

It is not a de Polignac number, because 145553213 - 2² = 145553209 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (145553273) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5598188 + ... + 5598213.

It is an arithmetic number, because the mean of its divisors is an integer number (39187407).

Almost surely, 2^145553213 is an apocalyptic number.

145553213 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

145553213 is a deficient number, since it is larger than the sum of its proper divisors (11196415).

145553213 is a wasteful number, since it uses less digits than its factorization.

145553213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11196414.

The product of its digits is 9000, while the sum is 29.

The square root of 145553213 is about 12064.5436299928. The cubic root of 145553213 is about 526.0260665035.

The spelling of 145553213 in words is "one hundred forty-five million, five hundred fifty-three thousand, two hundred thirteen".