71220719 has 4 divisors (see below), whose sum is σ = 74317296. Its totient is φ = 68124144.

The previous prime is 71220713. The next prime is 71220727. The reversal of 71220719 is 91702217.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 71220719 - 2¹² = 71216623 is a prime.

It is a super-2 number, since 2×71220719² = 10144781629753922, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 71220691 and 71220700.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71220713) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1548254 + ... + 1548299.

It is an arithmetic number, because the mean of its divisors is an integer number (18579324).

Almost surely, 2^71220719 is an apocalyptic number.

71220719 is a deficient number, since it is larger than the sum of its proper divisors (3096577).

71220719 is a wasteful number, since it uses less digits than its factorization.

71220719 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3096576.

The product of its (nonzero) digits is 1764, while the sum is 29.

The square root of 71220719 is about 8439.2368730828. The cubic root of 71220719 is about 414.5104189360.

The spelling of 71220719 in words is "seventy-one million, two hundred twenty thousand, seven hundred nineteen".