71945261 has 2 divisors, whose sum is σ = 71945262. Its totient is φ = 71945260.

The previous prime is 71945243. The next prime is 71945281. The reversal of 71945261 is 16254917.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 67404100 + 4541161 = 8210^2 + 2131^2 .

It is a cyclic number.

It is not a de Polignac number, because 71945261 - 2¹⁴ = 71928877 is a prime.

It is a super-2 number, since 2×71945261² = 10352241160716242, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (71945231) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35972630 + 35972631.

It is an arithmetic number, because the mean of its divisors is an integer number (35972631).

Almost surely, 2^71945261 is an apocalyptic number.

It is an amenable number.

71945261 is a deficient number, since it is larger than the sum of its proper divisors (1).

71945261 is an equidigital number, since it uses as much as digits as its factorization.

71945261 is an evil number, because the sum of its binary digits is even.

The product of its digits is 15120, while the sum is 35.

The square root of 71945261 is about 8482.0552344346. The cubic root of 71945261 is about 415.9113103737.

The spelling of 71945261 in words is "seventy-one million, nine hundred forty-five thousand, two hundred sixty-one".