201989747 has 4 divisors (see below), whose sum is σ = 203036520. Its totient is φ = 200942976.

The previous prime is 201989743. The next prime is 201989761. The reversal of 201989747 is 747989102.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 201989747 - 2² = 201989743 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (201989743) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 523097 + ... + 523482.

It is an arithmetic number, because the mean of its divisors is an integer number (50759130).

Almost surely, 2^201989747 is an apocalyptic number.

201989747 is a deficient number, since it is larger than the sum of its proper divisors (1046773).

201989747 is a wasteful number, since it uses less digits than its factorization.

201989747 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1046772.

The product of its (nonzero) digits is 254016, while the sum is 47.

The square root of 201989747 is about 14212.3096996934. The cubic root of 201989747 is about 586.7365034302.

The spelling of 201989747 in words is "two hundred one million, nine hundred eighty-nine thousand, seven hundred forty-seven".