71242961 has 2 divisors, whose sum is σ = 71242962. Its totient is φ = 71242960.

The previous prime is 71242943. The next prime is 71242993. The reversal of 71242961 is 16924217.

It is a happy number.

It is an a-pointer prime, because the next prime (71242993) can be obtained adding 71242961 to its sum of digits (32).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 66912400 + 4330561 = 8180^2 + 2081^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-71242961 is a prime.

It is not a weakly prime, because it can be changed into another prime (71242931) 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, 35621480 + 35621481.

It is an arithmetic number, because the mean of its divisors is an integer number (35621481).

Almost surely, 2^71242961 is an apocalyptic number.

It is an amenable number.

71242961 is a deficient number, since it is larger than the sum of its proper divisors (1).

71242961 is an equidigital number, since it uses as much as digits as its factorization.

71242961 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6048, while the sum is 32.

The square root of 71242961 is about 8440.5545433935. The cubic root of 71242961 is about 414.5535645323.

The spelling of 71242961 in words is "seventy-one million, two hundred forty-two thousand, nine hundred sixty-one".