201469981 has 2 divisors, whose sum is σ = 201469982. Its totient is φ = 201469980.

The previous prime is 201469973. The next prime is 201470011. The reversal of 201469981 is 189964102.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 122988100 + 78481881 = 11090^2 + 8859^2 .

It is a cyclic number.

It is not a de Polignac number, because 201469981 - 2³ = 201469973 is a prime.

It is a super-2 number, since 2×201469981² = 81180306488280722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (201469951) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100734990 + 100734991.

It is an arithmetic number, because the mean of its divisors is an integer number (100734991).

Almost surely, 2^201469981 is an apocalyptic number.

It is an amenable number.

201469981 is a deficient number, since it is larger than the sum of its proper divisors (1).

201469981 is an equidigital number, since it uses as much as digits as its factorization.

201469981 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 31104, while the sum is 40.

The square root of 201469981 is about 14194.0121530172. The cubic root of 201469981 is about 586.2328018862.

The spelling of 201469981 in words is "two hundred one million, four hundred sixty-nine thousand, nine hundred eighty-one".