71512349 has 4 divisors (see below), whose sum is σ = 71824860. Its totient is φ = 71199840.

The previous prime is 71512339. The next prime is 71512351. The reversal of 71512349 is 94321517.

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

It can be written as a sum of positive squares in 2 ways, for example, as 61387225 + 10125124 = 7835^2 + 3182^2 .

It is a cyclic number.

It is not a de Polignac number, because 71512349 - 2⁸ = 71512093 is a prime.

It is a super-2 number, since 2×71512349² = 10228032118995602, 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 (71512339) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 155912 + ... + 156369.

It is an arithmetic number, because the mean of its divisors is an integer number (17956215).

Almost surely, 2^71512349 is an apocalyptic number.

It is an amenable number.

71512349 is a deficient number, since it is larger than the sum of its proper divisors (312511).

71512349 is a wasteful number, since it uses less digits than its factorization.

71512349 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 312510.

The product of its digits is 7560, while the sum is 32.

The square root of 71512349 is about 8456.4974427951. The cubic root of 71512349 is about 415.0754186250.

The spelling of 71512349 in words is "seventy-one million, five hundred twelve thousand, three hundred forty-nine".