71961943 has 4 divisors (see below), whose sum is σ = 74283328. Its totient is φ = 69640560.

The previous prime is 71961941. The next prime is 71961947. The reversal of 71961943 is 34916917.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 34916917 = 7 ⋅4988131.

It is a cyclic number.

It is not a de Polignac number, because 71961943 - 2¹ = 71961941 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 71961896 and 71961905.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71961941) 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, 1160646 + ... + 1160707.

It is an arithmetic number, because the mean of its divisors is an integer number (18570832).

Almost surely, 2^71961943 is an apocalyptic number.

71961943 is a deficient number, since it is larger than the sum of its proper divisors (2321385).

71961943 is a wasteful number, since it uses less digits than its factorization.

71961943 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2321384.

The product of its digits is 40824, while the sum is 40.

The square root of 71961943 is about 8483.0385475960. The cubic root of 71961943 is about 415.9434537755.

The spelling of 71961943 in words is "seventy-one million, nine hundred sixty-one thousand, nine hundred forty-three".