71213961 has 16 divisors (see below), whose sum is σ = 116864384. Its totient is φ = 37563264.

The previous prime is 71213959. The next prime is 71213981. The reversal of 71213961 is 16931217.

It is not a de Polignac number, because 71213961 - 2¹ = 71213959 is a prime.

It is not an unprimeable number, because it can be changed into a prime (71213981) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 130156 + ... + 130701.

It is an arithmetic number, because the mean of its divisors is an integer number (7304024).

Almost surely, 2^71213961 is an apocalyptic number.

It is an amenable number.

71213961 is a deficient number, since it is larger than the sum of its proper divisors (45650423).

71213961 is a wasteful number, since it uses less digits than its factorization.

71213961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 260880.

The product of its digits is 2268, while the sum is 30.

The square root of 71213961 is about 8438.8364719314. The cubic root of 71213961 is about 414.4973078168.

The spelling of 71213961 in words is "seventy-one million, two hundred thirteen thousand, nine hundred sixty-one".