71222351 has 4 divisors (see below), whose sum is σ = 71278152. Its totient is φ = 71166552.

The previous prime is 71222341. The next prime is 71222353. The reversal of 71222351 is 15322217.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-71222351 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71222353) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25940 + ... + 28553.

It is an arithmetic number, because the mean of its divisors is an integer number (17819538).

Almost surely, 2^71222351 is an apocalyptic number.

71222351 is a deficient number, since it is larger than the sum of its proper divisors (55801).

71222351 is a wasteful number, since it uses less digits than its factorization.

71222351 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55800.

The product of its digits is 840, while the sum is 23.

The square root of 71222351 is about 8439.3335637359. Note that the first 3 decimals coincide. The cubic root of 71222351 is about 414.5135850364.

Adding to 71222351 its reverse (15322217), we get a palindrome (86544568).

The spelling of 71222351 in words is "seventy-one million, two hundred twenty-two thousand, three hundred fifty-one".