71641237 has 2 divisors, whose sum is σ = 71641238. Its totient is φ = 71641236.

The previous prime is 71641211. The next prime is 71641243. The reversal of 71641237 is 73214617.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 67256401 + 4384836 = 8201^2 + 2094^2 .

It is a cyclic number.

It is not a de Polignac number, because 71641237 - 2¹¹ = 71639189 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 71641199 and 71641208.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (71642237) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35820618 + 35820619.

It is an arithmetic number, because the mean of its divisors is an integer number (35820619).

Almost surely, 2^71641237 is an apocalyptic number.

It is an amenable number.

71641237 is a deficient number, since it is larger than the sum of its proper divisors (1).

71641237 is an equidigital number, since it uses as much as digits as its factorization.

71641237 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7056, while the sum is 31.

The square root of 71641237 is about 8464.1146613216. The cubic root of 71641237 is about 415.3246349406.

The spelling of 71641237 in words is "seventy-one million, six hundred forty-one thousand, two hundred thirty-seven".