201479981 has 2 divisors, whose sum is σ = 201479982. Its totient is φ = 201479980.

The previous prime is 201479953. The next prime is 201480029. The reversal of 201479981 is 189974102.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 104142025 + 97337956 = 10205^2 + 9866^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-201479981 is a prime.

It is a super-2 number, since 2×201479981² = 81188365487520722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (201479081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100739990 + 100739991.

It is an arithmetic number, because the mean of its divisors is an integer number (100739991).

Almost surely, 2^201479981 is an apocalyptic number.

It is an amenable number.

201479981 is a deficient number, since it is larger than the sum of its proper divisors (1).

201479981 is an equidigital number, since it uses as much as digits as its factorization.

201479981 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 36288, while the sum is 41.

The square root of 201479981 is about 14194.3644098635. The cubic root of 201479981 is about 586.2425009838.

The spelling of 201479981 in words is "two hundred one million, four hundred seventy-nine thousand, nine hundred eighty-one".