71979121 has 8 divisors (see below), whose sum is σ = 75193920. Its totient is φ = 68771472.

The previous prime is 71979113. The next prime is 71979199. The reversal of 71979121 is 12197917.

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

It is not a de Polignac number, because 71979121 - 2³ = 71979113 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (71970121) 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, 36271 + ... + 38203.

It is an arithmetic number, because the mean of its divisors is an integer number (9399240).

Almost surely, 2^71979121 is an apocalyptic number.

It is an amenable number.

71979121 is a deficient number, since it is larger than the sum of its proper divisors (3214799).

71979121 is a wasteful number, since it uses less digits than its factorization.

71979121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3575.

The product of its digits is 7938, while the sum is 37.

The square root of 71979121 is about 8484.0509781590. The cubic root of 71979121 is about 415.9765476948.

The spelling of 71979121 in words is "seventy-one million, nine hundred seventy-nine thousand, one hundred twenty-one".