201447997 has 2 divisors, whose sum is σ = 201447998. Its totient is φ = 201447996.

The previous prime is 201447989. The next prime is 201448003. The reversal of 201447997 is 799744102.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 145781476 + 55666521 = 12074^2 + 7461^2 .

It is a cyclic number.

It is not a de Polignac number, because 201447997 - 2³ = 201447989 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (201447907) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100723998 + 100723999.

It is an arithmetic number, because the mean of its divisors is an integer number (100723999).

Almost surely, 2^201447997 is an apocalyptic number.

It is an amenable number.

201447997 is a deficient number, since it is larger than the sum of its proper divisors (1).

201447997 is an equidigital number, since it uses as much as digits as its factorization.

201447997 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 127008, while the sum is 43.

The square root of 201447997 is about 14193.2377208303. The cubic root of 201447997 is about 586.2114782616.

The spelling of 201447997 in words is "two hundred one million, four hundred forty-seven thousand, nine hundred ninety-seven".