71220751 has 8 divisors (see below), whose sum is σ = 81525024. Its totient is φ = 60948960.

The previous prime is 71220749. The next prime is 71220757. The reversal of 71220751 is 15702217.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 71220751 - 2¹ = 71220749 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71220757) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3220 + ... + 12361.

It is an arithmetic number, because the mean of its divisors is an integer number (10190628).

Almost surely, 2^71220751 is an apocalyptic number.

71220751 is a deficient number, since it is larger than the sum of its proper divisors (10304273).

71220751 is a wasteful number, since it uses less digits than its factorization.

71220751 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16241.

The product of its (nonzero) digits is 980, while the sum is 25.

The square root of 71220751 is about 8439.2387689886. The cubic root of 71220751 is about 414.5104810169.

Adding to 71220751 its reverse (15702217), we get a palindrome (86922968).

The spelling of 71220751 in words is "seventy-one million, two hundred twenty thousand, seven hundred fifty-one".