16851953 has 2 divisors, whose sum is σ = 16851954. Its totient is φ = 16851952.

The previous prime is 16851949. The next prime is 16851973. The reversal of 16851953 is 35915861.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13778944 + 3073009 = 3712^2 + 1753^2 .

It is a cyclic number.

It is not a de Polignac number, because 16851953 - 2² = 16851949 is a prime.

It is not a weakly prime, because it can be changed into another prime (16851973) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8425976 + 8425977.

It is an arithmetic number, because the mean of its divisors is an integer number (8425977).

Almost surely, 2^16851953 is an apocalyptic number.

It is an amenable number.

16851953 is a deficient number, since it is larger than the sum of its proper divisors (1).

16851953 is an equidigital number, since it uses as much as digits as its factorization.

16851953 is an evil number, because the sum of its binary digits is even.

The product of its digits is 32400, while the sum is 38.

The square root of 16851953 is about 4105.1130313306. The cubic root of 16851953 is about 256.3795689776.

Subtracting from 16851953 its sum of digits (38), we obtain a triangular number (16851915 = T₅₈₀₅).

The spelling of 16851953 in words is "sixteen million, eight hundred fifty-one thousand, nine hundred fifty-three".