10657981 has 4 divisors (see below), whose sum is σ = 10832764. Its totient is φ = 10483200.

The previous prime is 10657973. The next prime is 10657987. The reversal of 10657981 is 18975601.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 18975601 = 89 ⋅213209.

It can be written as a sum of positive squares in 2 ways, for example, as 792100 + 9865881 = 890^2 + 3141^2 .

It is a cyclic number.

It is not a de Polignac number, because 10657981 - 2³ = 10657973 is a prime.

It is a super-2 number, since 2×10657981² = 227185117992722, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 10657981.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10657987) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 87300 + ... + 87421.

It is an arithmetic number, because the mean of its divisors is an integer number (2708191).

Almost surely, 2^10657981 is an apocalyptic number.

It is an amenable number.

10657981 is a deficient number, since it is larger than the sum of its proper divisors (174783).

10657981 is an equidigital number, since it uses as much as digits as its factorization.

10657981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 174782.

The product of its (nonzero) digits is 15120, while the sum is 37.

The square root of 10657981 is about 3264.6563371969. The cubic root of 10657981 is about 220.0687182027.

The spelling of 10657981 in words is "ten million, six hundred fifty-seven thousand, nine hundred eighty-one".