201081812 has 6 divisors (see below), whose sum is σ = 351893178. Its totient is φ = 100540904.

The previous prime is 201081787. The next prime is 201081817. The reversal of 201081812 is 218180102.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 168065296 + 33016516 = 12964^2 + 5746^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201081817) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25135223 + ... + 25135230.

It is an arithmetic number, because the mean of its divisors is an integer number (58648863).

Almost surely, 2^201081812 is an apocalyptic number.

It is an amenable number.

201081812 is a deficient number, since it is larger than the sum of its proper divisors (150811366).

201081812 is a wasteful number, since it uses less digits than its factorization.

201081812 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50270457 (or 50270455 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 23.

The square root of 201081812 is about 14180.3318719979. The cubic root of 201081812 is about 585.8560647007.

The spelling of 201081812 in words is "two hundred one million, eighty-one thousand, eight hundred twelve".