71650921 has 2 divisors, whose sum is σ = 71650922. Its totient is φ = 71650920.

The previous prime is 71650913. The next prime is 71650991. The reversal of 71650921 is 12905617.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 58690921 + 12960000 = 7661^2 + 3600^2 .

It is a cyclic number.

It is not a de Polignac number, because 71650921 - 2³ = 71650913 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (71650991) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35825460 + 35825461.

It is an arithmetic number, because the mean of its divisors is an integer number (35825461).

Almost surely, 2^71650921 is an apocalyptic number.

It is an amenable number.

71650921 is a deficient number, since it is larger than the sum of its proper divisors (1).

71650921 is an equidigital number, since it uses as much as digits as its factorization.

71650921 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3780, while the sum is 31.

The square root of 71650921 is about 8464.6867041846. The cubic root of 71650921 is about 415.3433477319.

The spelling of 71650921 in words is "seventy-one million, six hundred fifty thousand, nine hundred twenty-one".