71209801 has 4 divisors (see below), whose sum is σ = 76687492. Its totient is φ = 65732112.

The previous prime is 71209799. The next prime is 71209807. The reversal of 71209801 is 10890217.

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 18284176 + 52925625 = 4276^2 + 7275^2 .

It is a cyclic number.

It is not a de Polignac number, because 71209801 - 2¹ = 71209799 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 71209801.

It is not an unprimeable number, because it can be changed into a prime (71209807) 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, 2738826 + ... + 2738851.

It is an arithmetic number, because the mean of its divisors is an integer number (19171873).

Almost surely, 2^71209801 is an apocalyptic number.

It is an amenable number.

71209801 is a deficient number, since it is larger than the sum of its proper divisors (5477691).

71209801 is a wasteful number, since it uses less digits than its factorization.

71209801 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5477690.

The product of its (nonzero) digits is 1008, while the sum is 28.

The square root of 71209801 is about 8438.5899888548. The cubic root of 71209801 is about 414.4892366355.

It can be divided in two parts, 71209 and 801, that added together give a triangular number (72010 = T₃₇₉).

The spelling of 71209801 in words is "seventy-one million, two hundred nine thousand, eight hundred one".