71121601 has 8 divisors (see below), whose sum is σ = 74963880. Its totient is φ = 67372032.

The previous prime is 71121581. The next prime is 71121629. The reversal of 71121601 is 10612117.

It can be written as a sum of positive squares in 4 ways, for example, as 13133376 + 57988225 = 3624^2 + 7615^2 .

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 71121601 - 2⁵ = 71121569 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (71121641) 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, 21600 + ... + 24673.

It is an arithmetic number, because the mean of its divisors is an integer number (9370485).

Almost surely, 2^71121601 is an apocalyptic number.

It is an amenable number.

71121601 is a deficient number, since it is larger than the sum of its proper divisors (3842279).

71121601 is a wasteful number, since it uses less digits than its factorization.

71121601 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46355.

The product of its (nonzero) digits is 84, while the sum is 19.

The square root of 71121601 is about 8433.3623780791. The cubic root of 71121601 is about 414.3180380362.

Adding to 71121601 its reverse (10612117), we get a palindrome (81733718).

The spelling of 71121601 in words is "seventy-one million, one hundred twenty-one thousand, six hundred one".