201881669 has 12 divisors (see below), whose sum is σ = 232440480. Its totient is φ = 173865960.

The previous prime is 201881651. The next prime is 201881671. The reversal of 201881669 is 966188102.

It is not a de Polignac number, because 201881669 - 2¹² = 201877573 is a prime.

It is a super-2 number, since 2×201881669² = 81512416556451122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201881609) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 21449 + ... + 29390.

It is an arithmetic number, because the mean of its divisors is an integer number (19370040).

Almost surely, 2^201881669 is an apocalyptic number.

It is an amenable number.

201881669 is a deficient number, since it is larger than the sum of its proper divisors (30558811).

201881669 is a wasteful number, since it uses less digits than its factorization.

201881669 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50888 (or 50869 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 41.

The square root of 201881669 is about 14208.5069236708. The cubic root of 201881669 is about 586.6318370263.

The spelling of 201881669 in words is "two hundred one million, eight hundred eighty-one thousand, six hundred sixty-nine".