71556061 has 2 divisors, whose sum is σ = 71556062. Its totient is φ = 71556060.

The previous prime is 71556053. The next prime is 71556073. The reversal of 71556061 is 16065517.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 47692836 + 23863225 = 6906^2 + 4885^2 .

It is a cyclic number.

It is not a de Polignac number, because 71556061 - 2³ = 71556053 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (71556011) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35778030 + 35778031.

It is an arithmetic number, because the mean of its divisors is an integer number (35778031).

Almost surely, 2^71556061 is an apocalyptic number.

It is an amenable number.

71556061 is a deficient number, since it is larger than the sum of its proper divisors (1).

71556061 is an equidigital number, since it uses as much as digits as its factorization.

71556061 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6300, while the sum is 31.

The square root of 71556061 is about 8459.0815695322. The cubic root of 71556061 is about 415.1599731642.

The spelling of 71556061 in words is "seventy-one million, five hundred fifty-six thousand, sixty-one".