71491307 has 4 divisors (see below), whose sum is σ = 75696696. Its totient is φ = 67285920.

The previous prime is 71491283. The next prime is 71491333. The reversal of 71491307 is 70319417.

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 71491307 - 2⁸ = 71491051 is a prime.

It is a super-2 number, since 2×71491307² = 10222013953136498, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (71493307) 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, 2102669 + ... + 2102702.

It is an arithmetic number, because the mean of its divisors is an integer number (18924174).

Almost surely, 2^71491307 is an apocalyptic number.

71491307 is a deficient number, since it is larger than the sum of its proper divisors (4205389).

71491307 is a wasteful number, since it uses less digits than its factorization.

71491307 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4205388.

The product of its (nonzero) digits is 5292, while the sum is 32.

The square root of 71491307 is about 8455.2532191532. The cubic root of 71491307 is about 415.0347036349.

The spelling of 71491307 in words is "seventy-one million, four hundred ninety-one thousand, three hundred seven".