71518151 has 4 divisors (see below), whose sum is σ = 73451112. Its totient is φ = 69585192.

The previous prime is 71518129. The next prime is 71518163. The reversal of 71518151 is 15181517.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 71518151 - 2¹⁸ = 71256007 is a prime.

It is a super-2 number, since 2×71518151² = 10229691844917602, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71518351) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 966425 + ... + 966498.

It is an arithmetic number, because the mean of its divisors is an integer number (18362778).

Almost surely, 2^71518151 is an apocalyptic number.

71518151 is a deficient number, since it is larger than the sum of its proper divisors (1932961).

71518151 is a wasteful number, since it uses less digits than its factorization.

71518151 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1932960.

The product of its digits is 1400, while the sum is 29.

The square root of 71518151 is about 8456.8404856660. The cubic root of 71518151 is about 415.0866437373.

Adding to 71518151 its reverse (15181517), we get a palindrome (86699668).

The spelling of 71518151 in words is "seventy-one million, five hundred eighteen thousand, one hundred fifty-one".