145163821 has 24 divisors (see below), whose sum is σ = 169255800. Its totient is φ = 124185600.

The previous prime is 145163803. The next prime is 145163827. The reversal of 145163821 is 128361541.

It can be written as a sum of positive squares in 4 ways, for example, as 81796 + 145082025 = 286^2 + 12045^2 .

It is not a de Polignac number, because 145163821 - 2⁹ = 145163309 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 (145163827) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 143365 + ... + 144373.

It is an arithmetic number, because the mean of its divisors is an integer number (7052325).

Almost surely, 2^145163821 is an apocalyptic number.

145163821 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

145163821 is a deficient number, since it is larger than the sum of its proper divisors (24091979).

145163821 is a wasteful number, since it uses less digits than its factorization.

145163821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1101 (or 1090 counting only the distinct ones).

The product of its digits is 5760, while the sum is 31.

The square root of 145163821 is about 12048.3949553457. The cubic root of 145163821 is about 525.5565629049.

The spelling of 145163821 in words is "one hundred forty-five million, one hundred sixty-three thousand, eight hundred twenty-one".