10211945 has 4 divisors (see below), whose sum is σ = 12254340. Its totient is φ = 8169552.

The previous prime is 10211921. The next prime is 10211947. The reversal of 10211945 is 54911201.

It is a happy number.

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 6692569 + 3519376 = 2587^2 + 1876^2 .

It is a cyclic number.

It is not a de Polignac number, because 10211945 - 2¹² = 10207849 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 10211945.

It is not an unprimeable number, because it can be changed into a prime (10211947) 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 3 ways as a sum of consecutive naturals, for example, 1021190 + ... + 1021199.

It is an arithmetic number, because the mean of its divisors is an integer number (3063585).

Almost surely, 2^10211945 is an apocalyptic number.

It is an amenable number.

10211945 is a deficient number, since it is larger than the sum of its proper divisors (2042395).

10211945 is an equidigital number, since it uses as much as digits as its factorization.

10211945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2042394.

The product of its (nonzero) digits is 360, while the sum is 23.

The square root of 10211945 is about 3195.6133996465. The cubic root of 10211945 is about 216.9549128721.

The spelling of 10211945 in words is "ten million, two hundred eleven thousand, nine hundred forty-five".