144137821 has 2 divisors, whose sum is σ = 144137822. Its totient is φ = 144137820.

The previous prime is 144137809. The next prime is 144137827. The reversal of 144137821 is 128731441.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 95765796 + 48372025 = 9786^2 + 6955^2 .

It is a cyclic number.

It is not a de Polignac number, because 144137821 - 2⁵ = 144137789 is a prime.

It is a super-2 number, since 2×144137821² = 41551422885256082, which contains 22 as substring.

It is a Chen prime.

It is equal to p_8132764 and since 144137821 and 8132764 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 (144137827) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 72068910 + 72068911.

It is an arithmetic number, because the mean of its divisors is an integer number (72068911).

Almost surely, 2^144137821 is an apocalyptic number.

It is an amenable number.

144137821 is a deficient number, since it is larger than the sum of its proper divisors (1).

144137821 is an equidigital number, since it uses as much as digits as its factorization.

144137821 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5376, while the sum is 31.

The square root of 144137821 is about 12005.7411682911. The cubic root of 144137821 is about 524.3154445961.

The spelling of 144137821 in words is "one hundred forty-four million, one hundred thirty-seven thousand, eight hundred twenty-one".