71721103 has 2 divisors, whose sum is σ = 71721104. Its totient is φ = 71721102.

The previous prime is 71721101. The next prime is 71721109. The reversal of 71721103 is 30112717.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 71721103 - 2¹ = 71721101 is a prime.

Together with 71721101, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (71721101) 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 as a sum of consecutive naturals, namely, 35860551 + 35860552.

It is an arithmetic number, because the mean of its divisors is an integer number (35860552).

Almost surely, 2^71721103 is an apocalyptic number.

71721103 is a deficient number, since it is larger than the sum of its proper divisors (1).

71721103 is an equidigital number, since it uses as much as digits as its factorization.

71721103 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 294, while the sum is 22.

The square root of 71721103 is about 8468.8312652927. The cubic root of 71721103 is about 415.4789129336.

It can be divided in two parts, 71721 and 103, that added together give a square (71824 = 268²).

The spelling of 71721103 in words is "seventy-one million, seven hundred twenty-one thousand, one hundred three".