71735921 has 2 divisors, whose sum is σ = 71735922. Its totient is φ = 71735920.

The previous prime is 71735899. The next prime is 71735927. The reversal of 71735921 is 12953717.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 66650896 + 5085025 = 8164^2 + 2255^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-71735921 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (71735927) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35867960 + 35867961.

It is an arithmetic number, because the mean of its divisors is an integer number (35867961).

Almost surely, 2^71735921 is an apocalyptic number.

It is an amenable number.

71735921 is a deficient number, since it is larger than the sum of its proper divisors (1).

71735921 is an equidigital number, since it uses as much as digits as its factorization.

71735921 is an evil number, because the sum of its binary digits is even.

The product of its digits is 13230, while the sum is 35.

The square root of 71735921 is about 8469.7060751835. The cubic root of 71735921 is about 415.5075244223.

The spelling of 71735921 in words is "seventy-one million, seven hundred thirty-five thousand, nine hundred twenty-one".