71904281 has 2 divisors, whose sum is σ = 71904282. Its totient is φ = 71904280.

The previous prime is 71904263. The next prime is 71904307. The reversal of 71904281 is 18240917.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 59059225 + 12845056 = 7685^2 + 3584^2 .

It is a cyclic number.

It is not a de Polignac number, because 71904281 - 2¹⁰ = 71903257 is a prime.

It is a super-2 number, since 2×71904281² = 10340451252253922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (71904211) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35952140 + 35952141.

It is an arithmetic number, because the mean of its divisors is an integer number (35952141).

Almost surely, 2^71904281 is an apocalyptic number.

It is an amenable number.

71904281 is a deficient number, since it is larger than the sum of its proper divisors (1).

71904281 is an equidigital number, since it uses as much as digits as its factorization.

71904281 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4032, while the sum is 32.

The square root of 71904281 is about 8479.6392022302. The cubic root of 71904281 is about 415.8323277214.

The spelling of 71904281 in words is "seventy-one million, nine hundred four thousand, two hundred eighty-one".