9952001681 has 4 divisors (see below), whose sum is σ = 9964304100. Its totient is φ = 9939699264.

The previous prime is 9952001663. The next prime is 9952001693. The reversal of 9952001681 is 1861002599.

It is a happy number.

9952001681 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

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

It can be written as a sum of positive squares in 2 ways, for example, as 8026547281 + 1925454400 = 89591^2 + 43880^2 .

It is a cyclic number.

It is not a de Polignac number, because 9952001681 - 2⁶ = 9952001617 is a prime.

It is a super-2 number, since 2×9952001681² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (9952001611) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6149996 + ... + 6151613.

It is an arithmetic number, because the mean of its divisors is an integer number (2491076025).

Almost surely, 2^9952001681 is an apocalyptic number.

It is an amenable number.

9952001681 is a deficient number, since it is larger than the sum of its proper divisors (12302419).

9952001681 is a wasteful number, since it uses less digits than its factorization.

9952001681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12302418.

The product of its (nonzero) digits is 38880, while the sum is 41.

The square root of 9952001681 is about 99759.7197319640. The cubic root of 9952001681 is about 2150.9821855282.

The spelling of 9952001681 in words is "nine billion, nine hundred fifty-two million, one thousand, six hundred eighty-one".