100643953 has 2 divisors, whose sum is σ = 100643954. Its totient is φ = 100643952.

The previous prime is 100643941. The next prime is 100643957. The reversal of 100643953 is 359346001.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 89434849 + 11209104 = 9457^2 + 3348^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-100643953 is a prime.

It is not a weakly prime, because it can be changed into another prime (100643957) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50321976 + 50321977.

It is an arithmetic number, because the mean of its divisors is an integer number (50321977).

Almost surely, 2^100643953 is an apocalyptic number.

It is an amenable number.

100643953 is a deficient number, since it is larger than the sum of its proper divisors (1).

100643953 is an equidigital number, since it uses as much as digits as its factorization.

100643953 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9720, while the sum is 31.

The square root of 100643953 is about 10032.1459817927. The cubic root of 100643953 is about 465.1530740498.

Adding to 100643953 its reverse (359346001), we get a palindrome (459989954).

The spelling of 100643953 in words is "one hundred million, six hundred forty-three thousand, nine hundred fifty-three".