71801869 has 2 divisors, whose sum is σ = 71801870. Its totient is φ = 71801868.

The previous prime is 71801843. The next prime is 71801903. The reversal of 71801869 is 96810817.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 36542025 + 35259844 = 6045^2 + 5938^2 .

It is a cyclic number.

It is not a de Polignac number, because 71801869 - 2¹¹ = 71799821 is a prime.

It is a super-2 number, since 2×71801869² = 10311016783786322, 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 (71801839) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35900934 + 35900935.

It is an arithmetic number, because the mean of its divisors is an integer number (35900935).

Almost surely, 2^71801869 is an apocalyptic number.

It is an amenable number.

71801869 is a deficient number, since it is larger than the sum of its proper divisors (1).

71801869 is an equidigital number, since it uses as much as digits as its factorization.

71801869 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 24192, while the sum is 40.

The square root of 71801869 is about 8473.5983501698. The cubic root of 71801869 is about 415.6348130346.

The spelling of 71801869 in words is "seventy-one million, eight hundred one thousand, eight hundred sixty-nine".