52101981 has 16 divisors (see below), whose sum is σ = 77584000. Its totient is φ = 34556544.

The previous prime is 52101953. The next prime is 52102007. The reversal of 52101981 is 18910125.

52101981 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 52101981 - 2¹⁴ = 52085597 is a prime.

It is a super-2 number, since 2×52101981² = 5429232848248722, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (52101911) 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 15 ways as a sum of consecutive naturals, for example, 525 + ... + 10221.

It is an arithmetic number, because the mean of its divisors is an integer number (4849000).

Almost surely, 2^52101981 is an apocalyptic number.

It is an amenable number.

52101981 is a deficient number, since it is larger than the sum of its proper divisors (25482019).

52101981 is a wasteful number, since it uses less digits than its factorization.

52101981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9905 (or 9899 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 27.

The square root of 52101981 is about 7218.1701974947. The cubic root of 52101981 is about 373.4949596907.

The spelling of 52101981 in words is "fifty-two million, one hundred one thousand, nine hundred eighty-one".