144971917 has 2 divisors, whose sum is σ = 144971918. Its totient is φ = 144971916.

The previous prime is 144971851. The next prime is 144971993. The reversal of 144971917 is 719179441.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 121749156 + 23222761 = 11034^2 + 4819^2 .

It is a cyclic number.

It is not a de Polignac number, because 144971917 - 2⁷ = 144971789 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (144971117) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 72485958 + 72485959.

It is an arithmetic number, because the mean of its divisors is an integer number (72485959).

Almost surely, 2^144971917 is an apocalyptic number.

It is an amenable number.

144971917 is a deficient number, since it is larger than the sum of its proper divisors (1).

144971917 is an equidigital number, since it uses as much as digits as its factorization.

144971917 is an evil number, because the sum of its binary digits is even.

The product of its digits is 63504, while the sum is 43.

The square root of 144971917 is about 12040.4284392209. The cubic root of 144971917 is about 525.3248686208.

The spelling of 144971917 in words is "one hundred forty-four million, nine hundred seventy-one thousand, nine hundred seventeen".