145201997 has 2 divisors, whose sum is σ = 145201998. Its totient is φ = 145201996.

The previous prime is 145201993. The next prime is 145202003. The reversal of 145201997 is 799102541.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 121572676 + 23629321 = 11026^2 + 4861^2 .

It is an emirp because it is prime and its reverse (799102541) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 145201997 - 2² = 145201993 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 145201997.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (145201993) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 72600998 + 72600999.

It is an arithmetic number, because the mean of its divisors is an integer number (72600999).

Almost surely, 2^145201997 is an apocalyptic number.

It is an amenable number.

145201997 is a deficient number, since it is larger than the sum of its proper divisors (1).

145201997 is an equidigital number, since it uses as much as digits as its factorization.

145201997 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 22680, while the sum is 38.

The square root of 145201997 is about 12049.9791286126. The cubic root of 145201997 is about 525.6026301427.

The spelling of 145201997 in words is "one hundred forty-five million, two hundred one thousand, nine hundred ninety-seven".