71421929 has 2 divisors, whose sum is σ = 71421930. Its totient is φ = 71421928.

The previous prime is 71421881. The next prime is 71421937. The reversal of 71421929 is 92912417.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 65286400 + 6135529 = 8080^2 + 2477^2 .

It is a cyclic number.

It is not a de Polignac number, because 71421929 - 2⁸ = 71421673 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (71421949) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35710964 + 35710965.

It is an arithmetic number, because the mean of its divisors is an integer number (35710965).

Almost surely, 2^71421929 is an apocalyptic number.

It is an amenable number.

71421929 is a deficient number, since it is larger than the sum of its proper divisors (1).

71421929 is an equidigital number, since it uses as much as digits as its factorization.

71421929 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9072, while the sum is 35.

The square root of 71421929 is about 8451.1495667749. The cubic root of 71421929 is about 414.9004048030.

The spelling of 71421929 in words is "seventy-one million, four hundred twenty-one thousand, nine hundred twenty-nine".