71989951 has 8 divisors (see below), whose sum is σ = 83154384. Its totient is φ = 61595520.

The previous prime is 71989937. The next prime is 71989963. The reversal of 71989951 is 15998917.

It is a happy number.

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 71989951 - 2¹⁷ = 71858879 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 71989895 and 71989904.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71989991) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 192300 + ... + 192673.

It is an arithmetic number, because the mean of its divisors is an integer number (10394298).

Almost surely, 2^71989951 is an apocalyptic number.

71989951 is a deficient number, since it is larger than the sum of its proper divisors (11164433).

71989951 is a wasteful number, since it uses less digits than its factorization.

71989951 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 385001.

The product of its digits is 204120, while the sum is 49.

The square root of 71989951 is about 8484.6892105722. The cubic root of 71989951 is about 415.9974093003.

The spelling of 71989951 in words is "seventy-one million, nine hundred eighty-nine thousand, nine hundred fifty-one".