71453209 has 9 divisors (see below), whose sum is σ = 73051797. Its totient is φ = 69889404.

The previous prime is 71453197. The next prime is 71453231. The reversal of 71453209 is 90235417.

The square root of 71453209 is 8453.

It is a perfect power (a square), and thus also a powerful number.

It is not a de Polignac number, because 71453209 - 2¹¹ = 71451161 is a prime.

It is a super-2 number, since 2×71453209² = 10211122152795362, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (71453269) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 667734 + ... + 667840.

Almost surely, 2^71453209 is an apocalyptic number.

71453209 is a gapful number since it is divisible by the number (79) formed by its first and last digit.

71453209 is the 8453-rd square number.

71453209 is the 4227-th centered octagonal number.

It is an amenable number.

71453209 is a deficient number, since it is larger than the sum of its proper divisors (1598588).

71453209 is an frugal number, since it uses more digits than its factorization.

71453209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 372 (or 186 counting only the distinct ones).

The product of its (nonzero) digits is 7560, while the sum is 31.

The cubic root of 71453209 is about 414.9609659904.

The spelling of 71453209 in words is "seventy-one million, four hundred fifty-three thousand, two hundred nine".