10129981 has 4 divisors (see below), whose sum is σ = 10136764. Its totient is φ = 10123200.

The previous prime is 10129979. The next prime is 10130009. The reversal of 10129981 is 18992101.

10129981 is digitally balanced in base 2, 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, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 18992101 = 3307 ⋅5743.

It can be written as a sum of positive squares in 2 ways, for example, as 5134756 + 4995225 = 2266^2 + 2235^2 .

It is a cyclic number.

It is not a de Polignac number, because 10129981 - 2¹ = 10129979 is a prime.

It is a super-2 number, since 2×10129981² = 205233030120722, 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 (10129081) 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, 60 + ... + 4501.

It is an arithmetic number, because the mean of its divisors is an integer number (2534191).

Almost surely, 2^10129981 is an apocalyptic number.

It is an amenable number.

10129981 is a deficient number, since it is larger than the sum of its proper divisors (6783).

10129981 is an equidigital number, since it uses as much as digits as its factorization.

10129981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6782.

The product of its (nonzero) digits is 1296, while the sum is 31.

The square root of 10129981 is about 3182.7631077414. The cubic root of 10129981 is about 216.3729055086.

The spelling of 10129981 in words is "ten million, one hundred twenty-nine thousand, nine hundred eighty-one".