201081810 has 32 divisors (see below), whose sum is σ = 498166272. Its totient is φ = 51891840.

The previous prime is 201081787. The next prime is 201081817. The reversal of 201081810 is 18180102.

It is a super-2 number, since 2×201081810² = 80867788625752200, which contains 22 as substring.

It is a Curzon 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 in 15 ways as a sum of consecutive naturals, for example, 107179 + ... + 109038.

It is an arithmetic number, because the mean of its divisors is an integer number (15567696).

Almost surely, 2^201081810 is an apocalyptic number.

201081810 is an abundant number, since it is smaller than the sum of its proper divisors (297084462).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

201081810 is a wasteful number, since it uses less digits than its factorization.

201081810 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 216258.

The product of its (nonzero) digits is 128, while the sum is 21.

The square root of 201081810 is about 14180.3318014777. The cubic root of 201081810 is about 585.8560627583.

The spelling of 201081810 in words is "two hundred one million, eighty-one thousand, eight hundred ten".