71259961 has 2 divisors, whose sum is σ = 71259962. Its totient is φ = 71259960.

The previous prime is 71259953. The next prime is 71259973. The reversal of 71259961 is 16995217.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 67815225 + 3444736 = 8235^2 + 1856^2 .

It is a cyclic number.

It is not a de Polignac number, because 71259961 - 2³ = 71259953 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (71259761) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35629980 + 35629981.

It is an arithmetic number, because the mean of its divisors is an integer number (35629981).

Almost surely, 2^71259961 is an apocalyptic number.

It is an amenable number.

71259961 is a deficient number, since it is larger than the sum of its proper divisors (1).

71259961 is an equidigital number, since it uses as much as digits as its factorization.

71259961 is an evil number, because the sum of its binary digits is even.

The product of its digits is 34020, while the sum is 40.

The square root of 71259961 is about 8441.5615261633. The cubic root of 71259961 is about 414.5865355094.

The spelling of 71259961 in words is "seventy-one million, two hundred fifty-nine thousand, nine hundred sixty-one".