71220501 has 24 divisors (see below), whose sum is σ = 112507200. Its totient is φ = 43056000.

The previous prime is 71220481. The next prime is 71220503. The reversal of 71220501 is 10502217.

It is not a de Polignac number, because 71220501 - 2⁵ = 71220469 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71220503) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 58701 + ... + 59901.

It is an arithmetic number, because the mean of its divisors is an integer number (4687800).

Almost surely, 2^71220501 is an apocalyptic number.

It is an amenable number.

71220501 is a deficient number, since it is larger than the sum of its proper divisors (41286699).

71220501 is a wasteful number, since it uses less digits than its factorization.

71220501 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1817 (or 1814 counting only the distinct ones).

The product of its (nonzero) digits is 140, while the sum is 18.

The square root of 71220501 is about 8439.2239572131. The cubic root of 71220501 is about 414.5099960096.

Adding to 71220501 its reverse (10502217), we get a palindrome (81722718).

The spelling of 71220501 in words is "seventy-one million, two hundred twenty thousand, five hundred one".