71549861 has 2 divisors, whose sum is σ = 71549862. Its totient is φ = 71549860.

The previous prime is 71549857. The next prime is 71549869. The reversal of 71549861 is 16894517.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 68724100 + 2825761 = 8290^2 + 1681^2 .

It is a cyclic number.

It is not a de Polignac number, because 71549861 - 2² = 71549857 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (71549869) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35774930 + 35774931.

It is an arithmetic number, because the mean of its divisors is an integer number (35774931).

Almost surely, 2^71549861 is an apocalyptic number.

It is an amenable number.

71549861 is a deficient number, since it is larger than the sum of its proper divisors (1).

71549861 is an equidigital number, since it uses as much as digits as its factorization.

71549861 is an evil number, because the sum of its binary digits is even.

The product of its digits is 60480, while the sum is 41.

The square root of 71549861 is about 8458.7150915491. The cubic root of 71549861 is about 415.1479822574.

The spelling of 71549861 in words is "seventy-one million, five hundred forty-nine thousand, eight hundred sixty-one".