71749021 has 2 divisors, whose sum is σ = 71749022. Its totient is φ = 71749020.

The previous prime is 71748991. The next prime is 71749033. The reversal of 71749021 is 12094717.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 38812900 + 32936121 = 6230^2 + 5739^2 .

It is a cyclic number.

It is not a de Polignac number, because 71749021 - 2¹¹ = 71746973 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (71749621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35874510 + 35874511.

It is an arithmetic number, because the mean of its divisors is an integer number (35874511).

Almost surely, 2^71749021 is an apocalyptic number.

It is an amenable number.

71749021 is a deficient number, since it is larger than the sum of its proper divisors (1).

71749021 is an equidigital number, since it uses as much as digits as its factorization.

71749021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3528, while the sum is 31.

The square root of 71749021 is about 8470.4793843088. The cubic root of 71749021 is about 415.5328154118.

The spelling of 71749021 in words is "seventy-one million, seven hundred forty-nine thousand, twenty-one".