71929861 has 2 divisors, whose sum is σ = 71929862. Its totient is φ = 71929860.

The previous prime is 71929853. The next prime is 71929903. The reversal of 71929861 is 16892917.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 71927361 + 2500 = 8481^2 + 50^2 .

It is a cyclic number.

It is not a de Polignac number, because 71929861 - 2³ = 71929853 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (71929061) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35964930 + 35964931.

It is an arithmetic number, because the mean of its divisors is an integer number (35964931).

Almost surely, 2^71929861 is an apocalyptic number.

It is an amenable number.

71929861 is a deficient number, since it is larger than the sum of its proper divisors (1).

71929861 is an equidigital number, since it uses as much as digits as its factorization.

71929861 is an evil number, because the sum of its binary digits is even.

The product of its digits is 54432, while the sum is 43.

The square root of 71929861 is about 8481.1473869990. The cubic root of 71929861 is about 415.8816327589.

The spelling of 71929861 in words is "seventy-one million, nine hundred twenty-nine thousand, eight hundred sixty-one".