71961291 has 12 divisors (see below), whose sum is σ = 107794232. Its totient is φ = 47974032.

The previous prime is 71961287. The next prime is 71961299. The reversal of 71961291 is 19216917.

It is not a de Polignac number, because 71961291 - 2² = 71961287 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (71961299) 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 11 ways as a sum of consecutive naturals, for example, 147826 + ... + 148311.

Almost surely, 2^71961291 is an apocalyptic number.

71961291 is a deficient number, since it is larger than the sum of its proper divisors (35832941).

71961291 is an equidigital number, since it uses as much as digits as its factorization.

71961291 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 296152 (or 296140 counting only the distinct ones).

The product of its digits is 6804, while the sum is 36.

The square root of 71961291 is about 8483.0001178828. Note that the first 3 decimals coincide. The cubic root of 71961291 is about 415.9421975747.

The spelling of 71961291 in words is "seventy-one million, nine hundred sixty-one thousand, two hundred ninety-one".