71356121 has 4 divisors (see below), whose sum is σ = 71392932. Its totient is φ = 71319312.

The previous prime is 71356081. The next prime is 71356133. The reversal of 71356121 is 12165317.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 26666896 + 44689225 = 5164^2 + 6685^2 .

It is a cyclic number.

It is not a de Polignac number, because 71356121 - 2⁶ = 71356057 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (71356321) 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, 15326 + ... + 19431.

It is an arithmetic number, because the mean of its divisors is an integer number (17848233).

Almost surely, 2^71356121 is an apocalyptic number.

It is an amenable number.

71356121 is a deficient number, since it is larger than the sum of its proper divisors (36811).

71356121 is a wasteful number, since it uses less digits than its factorization.

71356121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36810.

The product of its digits is 1260, while the sum is 26.

The square root of 71356121 is about 8447.2552346901. The cubic root of 71356121 is about 414.7729362211.

The spelling of 71356121 in words is "seventy-one million, three hundred fifty-six thousand, one hundred twenty-one".