71924561 has 2 divisors, whose sum is σ = 71924562. Its totient is φ = 71924560.

The previous prime is 71924533. The next prime is 71924597. The reversal of 71924561 is 16542917.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 71910400 + 14161 = 8480^2 + 119^2 .

It is a cyclic number.

It is not a de Polignac number, because 71924561 - 2⁶ = 71924497 is a prime.

It is not a weakly prime, because it can be changed into another prime (71924521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35962280 + 35962281.

It is an arithmetic number, because the mean of its divisors is an integer number (35962281).

Almost surely, 2^71924561 is an apocalyptic number.

It is an amenable number.

71924561 is a deficient number, since it is larger than the sum of its proper divisors (1).

71924561 is an equidigital number, since it uses as much as digits as its factorization.

71924561 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 15120, while the sum is 35.

The square root of 71924561 is about 8480.8349235202. The cubic root of 71924561 is about 415.8714180546.

The spelling of 71924561 in words is "seventy-one million, nine hundred twenty-four thousand, five hundred sixty-one".