10351981 has 4 divisors (see below), whose sum is σ = 10358464. Its totient is φ = 10345500.

The previous prime is 10351951. The next prime is 10352029. The reversal of 10351981 is 18915301.

10351981 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, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 10351981 - 2⁷ = 10351853 is a prime.

It is a super-2 number, since 2×10351981² = 214327021248722, 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 (10351931) 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, 1036 + ... + 4666.

It is an arithmetic number, because the mean of its divisors is an integer number (2589616).

Almost surely, 2^10351981 is an apocalyptic number.

It is an amenable number.

10351981 is a deficient number, since it is larger than the sum of its proper divisors (6483).

10351981 is an equidigital number, since it uses as much as digits as its factorization.

10351981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6482.

The product of its (nonzero) digits is 1080, while the sum is 28.

The square root of 10351981 is about 3217.4494557025. The cubic root of 10351981 is about 217.9421121162.

The spelling of 10351981 in words is "ten million, three hundred fifty-one thousand, nine hundred eighty-one".