71961559 has 8 divisors (see below), whose sum is σ = 75480768. Its totient is φ = 68525280.

The previous prime is 71961541. The next prime is 71961577. The reversal of 71961559 is 95516917.

It is an interprime number because it is at equal distance from previous prime (71961541) and next prime (71961577).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 71961559 - 2⁹ = 71961047 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71961529) 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 7 ways as a sum of consecutive naturals, for example, 18952 + ... + 22429.

It is an arithmetic number, because the mean of its divisors is an integer number (9435096).

Almost surely, 2^71961559 is an apocalyptic number.

71961559 is a deficient number, since it is larger than the sum of its proper divisors (3519209).

71961559 is a wasteful number, since it uses less digits than its factorization.

71961559 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41465.

The product of its digits is 85050, while the sum is 43.

The square root of 71961559 is about 8483.0159141664. The cubic root of 71961559 is about 415.9427139281.

The spelling of 71961559 in words is "seventy-one million, nine hundred sixty-one thousand, five hundred fifty-nine".