71089861 has 4 divisors (see below), whose sum is σ = 71107372. Its totient is φ = 71072352.

The previous prime is 71089831. The next prime is 71089871. The reversal of 71089861 is 16898017.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 429025 + 70660836 = 655^2 + 8406^2 .

It is a cyclic number.

It is not a de Polignac number, because 71089861 - 2⁹ = 71089349 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71089831) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 841 + ... + 11953.

It is an arithmetic number, because the mean of its divisors is an integer number (17776843).

Almost surely, 2^71089861 is an apocalyptic number.

It is an amenable number.

71089861 is a deficient number, since it is larger than the sum of its proper divisors (17511).

71089861 is a wasteful number, since it uses less digits than its factorization.

71089861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17510.

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

The square root of 71089861 is about 8431.4803563787. The cubic root of 71089861 is about 414.2563952016.

The spelling of 71089861 in words is "seventy-one million, eighty-nine thousand, eight hundred sixty-one".