144987421 has 2 divisors, whose sum is σ = 144987422. Its totient is φ = 144987420.

The previous prime is 144987379. The next prime is 144987431. The reversal of 144987421 is 124789441.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 97239321 + 47748100 = 9861^2 + 6910^2 .

It is a cyclic number.

It is not a de Polignac number, because 144987421 - 2⁹ = 144986909 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (144987431) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 72493710 + 72493711.

It is an arithmetic number, because the mean of its divisors is an integer number (72493711).

Almost surely, 2^144987421 is an apocalyptic number.

It is an amenable number.

144987421 is a deficient number, since it is larger than the sum of its proper divisors (1).

144987421 is an equidigital number, since it uses as much as digits as its factorization.

144987421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 64512, while the sum is 40.

The square root of 144987421 is about 12041.0722529183. The cubic root of 144987421 is about 525.3435948831.

The spelling of 144987421 in words is "one hundred forty-four million, nine hundred eighty-seven thousand, four hundred twenty-one".