71971331 has 2 divisors, whose sum is σ = 71971332. Its totient is φ = 71971330.

The previous prime is 71971307. The next prime is 71971349. The reversal of 71971331 is 13317917.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 71971331 - 2⁶ = 71971267 is a prime.

It is a super-2 number, since 2×71971331² = 10359744971823122, which contains 22 as substring.

It is a Sophie Germain prime.

It is equal to p_4227098 and since 71971331 and 4227098 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (71971391) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35985665 + 35985666.

It is an arithmetic number, because the mean of its divisors is an integer number (35985666).

Almost surely, 2^71971331 is an apocalyptic number.

71971331 is a deficient number, since it is larger than the sum of its proper divisors (1).

71971331 is an equidigital number, since it uses as much as digits as its factorization.

71971331 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3969, while the sum is 32.

The square root of 71971331 is about 8483.5918690140. The cubic root of 71971331 is about 415.9615406845.

The spelling of 71971331 in words is "seventy-one million, nine hundred seventy-one thousand, three hundred thirty-one".