201667631 has 8 divisors (see below), whose sum is σ = 220816128. Its totient is φ = 182655000.

The previous prime is 201667607. The next prime is 201667637. The reversal of 201667631 is 136766102.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 201667631 - 2⁶ = 201667567 is a prime.

It is a super-2 number, since 2×201667631² = 81339666786304322, 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 (201667637) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 30845 + ... + 36806.

It is an arithmetic number, because the mean of its divisors is an integer number (27602016).

Almost surely, 2^201667631 is an apocalyptic number.

201667631 is a deficient number, since it is larger than the sum of its proper divisors (19148497).

201667631 is a wasteful number, since it uses less digits than its factorization.

201667631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67933.

The product of its (nonzero) digits is 9072, while the sum is 32.

The square root of 201667631 is about 14200.9728892073. The cubic root of 201667631 is about 586.4244450658.

The spelling of 201667631 in words is "two hundred one million, six hundred sixty-seven thousand, six hundred thirty-one".