201651647 has 2 divisors, whose sum is σ = 201651648. Its totient is φ = 201651646.

The previous prime is 201651641. The next prime is 201651679. The reversal of 201651647 is 746156102.

It is an a-pointer prime, because the next prime (201651679) can be obtained adding 201651647 to its sum of digits (32).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 201651647 - 2⁴ = 201651631 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (201651641) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100825823 + 100825824.

It is an arithmetic number, because the mean of its divisors is an integer number (100825824).

Almost surely, 2^201651647 is an apocalyptic number.

201651647 is a deficient number, since it is larger than the sum of its proper divisors (1).

201651647 is an equidigital number, since it uses as much as digits as its factorization.

201651647 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10080, while the sum is 32.

The square root of 201651647 is about 14200.4100997119. The cubic root of 201651647 is about 586.4089514937.

It can be divided in two parts, 20165 and 1647, that added together give a palindrome (21812).

The spelling of 201651647 in words is "two hundred one million, six hundred fifty-one thousand, six hundred forty-seven".