71515313 has 4 divisors (see below), whose sum is σ = 71714880. Its totient is φ = 71315748.

The previous prime is 71515309. The next prime is 71515337. The reversal of 71515313 is 31351517.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 71515313 - 2² = 71515309 is a prime.

It is a super-2 number, since 2×71515313² = 10228879986975938, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (71515393) 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, 99245 + ... + 99962.

It is an arithmetic number, because the mean of its divisors is an integer number (17928720).

Almost surely, 2^71515313 is an apocalyptic number.

It is an amenable number.

71515313 is a deficient number, since it is larger than the sum of its proper divisors (199567).

71515313 is a wasteful number, since it uses less digits than its factorization.

71515313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 199566.

The product of its digits is 1575, while the sum is 26.

The square root of 71515313 is about 8456.6726908401. The cubic root of 71515313 is about 415.0811531429.

The spelling of 71515313 in words is "seventy-one million, five hundred fifteen thousand, three hundred thirteen".