71691241 has 4 divisors (see below), whose sum is σ = 71898192. Its totient is φ = 71484292.

The previous prime is 71691229. The next prime is 71691307. The reversal of 71691241 is 14219617.

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 71691241 - 2⁵ = 71691209 is a prime.

It is a super-2 number, since 2×71691241² = 10279268072240162, which contains 22 as substring.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (71691041) 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, 102955 + ... + 103648.

It is an arithmetic number, because the mean of its divisors is an integer number (17974548).

Almost surely, 2^71691241 is an apocalyptic number.

It is an amenable number.

71691241 is a deficient number, since it is larger than the sum of its proper divisors (206951).

71691241 is a wasteful number, since it uses less digits than its factorization.

71691241 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 206950.

The product of its digits is 3024, while the sum is 31.

The square root of 71691241 is about 8467.0680285445. The cubic root of 71691241 is about 415.4212416062.

The spelling of 71691241 in words is "seventy-one million, six hundred ninety-one thousand, two hundred forty-one".