900144821 has 2 divisors, whose sum is σ = 900144822. Its totient is φ = 900144820.

The previous prime is 900144809. The next prime is 900144827. The reversal of 900144821 is 128441009.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 882387025 + 17757796 = 29705^2 + 4214^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-900144821 is a prime.

It is equal to p_46016219 and since 900144821 and 46016219 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (900144827) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 450072410 + 450072411.

It is an arithmetic number, because the mean of its divisors is an integer number (450072411).

Almost surely, 2^900144821 is an apocalyptic number.

It is an amenable number.

900144821 is a deficient number, since it is larger than the sum of its proper divisors (1).

900144821 is an equidigital number, since it uses as much as digits as its factorization.

900144821 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2304, while the sum is 29.

The square root of 900144821 is about 30002.4135862434. The cubic root of 900144821 is about 965.5411681757.

The spelling of 900144821 in words is "nine hundred million, one hundred forty-four thousand, eight hundred twenty-one".