71242551 has 8 divisors (see below), whose sum is σ = 105544560. Its totient is φ = 47495016.

The previous prime is 71242519. The next prime is 71242601. The reversal of 71242551 is 15524217.

71242551 is a `hidden beast` number, since 71 + 2 + 42 + 551 = 666.

It is not a de Polignac number, because 71242551 - 2⁵ = 71242519 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 2638613 = 71242551 / (7 + 1 + 2 + 4 + 2 + 5 + 5 + 1).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71242511) 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, 1319280 + ... + 1319333.

It is an arithmetic number, because the mean of its divisors is an integer number (13193070).

Almost surely, 2^71242551 is an apocalyptic number.

71242551 is a deficient number, since it is larger than the sum of its proper divisors (34302009).

71242551 is a wasteful number, since it uses less digits than its factorization.

71242551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2638622 (or 2638616 counting only the distinct ones).

The product of its digits is 2800, while the sum is 27.

The square root of 71242551 is about 8440.5302558548. The cubic root of 71242551 is about 414.5527692851.

Adding to 71242551 its reverse (15524217), we get a palindrome (86766768).

The spelling of 71242551 in words is "seventy-one million, two hundred forty-two thousand, five hundred fifty-one".