71142961 has 2 divisors, whose sum is σ = 71142962. Its totient is φ = 71142960.

The previous prime is 71142949. The next prime is 71142983. The reversal of 71142961 is 16924117.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 59582961 + 11560000 = 7719^2 + 3400^2 .

It is a cyclic number.

It is not a de Polignac number, because 71142961 - 2⁷ = 71142833 is a prime.

It is a super-2 number, since 2×71142961² = 10122641799695042, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (71142901) 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, 35571480 + 35571481.

It is an arithmetic number, because the mean of its divisors is an integer number (35571481).

Almost surely, 2^71142961 is an apocalyptic number.

It is an amenable number.

71142961 is a deficient number, since it is larger than the sum of its proper divisors (1).

71142961 is an equidigital number, since it uses as much as digits as its factorization.

71142961 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3024, while the sum is 31.

The square root of 71142961 is about 8434.6286818093. The cubic root of 71142961 is about 414.3595113597.

The spelling of 71142961 in words is "seventy-one million, one hundred forty-two thousand, nine hundred sixty-one".