71720151 has 16 divisors (see below), whose sum is σ = 97189344. Its totient is φ = 47038464.

The previous prime is 71720149. The next prime is 71720177. The reversal of 71720151 is 15102717.

It is a happy number.

It is not a de Polignac number, because 71720151 - 2¹ = 71720149 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71720101) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 55525 + ... + 56801.

It is an arithmetic number, because the mean of its divisors is an integer number (6074334).

Almost surely, 2^71720151 is an apocalyptic number.

71720151 is a deficient number, since it is larger than the sum of its proper divisors (25469193).

71720151 is a wasteful number, since it uses less digits than its factorization.

71720151 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1570.

The product of its (nonzero) digits is 490, while the sum is 24.

The square root of 71720151 is about 8468.7750590035. The cubic root of 71720151 is about 415.4770746198.

Adding to 71720151 its reverse (15102717), we get a palindrome (86822868).

The spelling of 71720151 in words is "seventy-one million, seven hundred twenty thousand, one hundred fifty-one".