16951945 has 4 divisors (see below), whose sum is σ = 20342340. Its totient is φ = 13561552.

The previous prime is 16951937. The next prime is 16951981. The reversal of 16951945 is 54915961.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 54915961 = 59 ⋅930779.

It can be written as a sum of positive squares in 2 ways, for example, as 3024121 + 13927824 = 1739^2 + 3732^2 .

It is a cyclic number.

It is not a de Polignac number, because 16951945 - 2³ = 16951937 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a junction number, because it is equal to n+sod(n) for n = 16951898 and 16951907.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1695190 + ... + 1695199.

It is an arithmetic number, because the mean of its divisors is an integer number (5085585).

Almost surely, 2^16951945 is an apocalyptic number.

It is an amenable number.

16951945 is a deficient number, since it is larger than the sum of its proper divisors (3390395).

16951945 is an equidigital number, since it uses as much as digits as its factorization.

16951945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3390394.

The product of its digits is 48600, while the sum is 40.

The square root of 16951945 is about 4117.2739767958. The cubic root of 16951945 is about 256.8856501486.

The spelling of 16951945 in words is "sixteen million, nine hundred fifty-one thousand, nine hundred forty-five".