81860701 has 4 divisors (see below), whose sum is σ = 88157692. Its totient is φ = 75563712.

The previous prime is 81860663. The next prime is 81860741. The reversal of 81860701 is 10706818.

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 35688676 + 46172025 = 5974^2 + 6795^2 .

It is a cyclic number.

It is not a de Polignac number, because 81860701 - 2¹³ = 81852509 is a prime.

It is a super-2 number, since 2×81860701² = 13402348736422802, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81860741) 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, 3148476 + ... + 3148501.

It is an arithmetic number, because the mean of its divisors is an integer number (22039423).

Almost surely, 2^81860701 is an apocalyptic number.

It is an amenable number.

81860701 is a deficient number, since it is larger than the sum of its proper divisors (6296991).

81860701 is a wasteful number, since it uses less digits than its factorization.

81860701 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6296990.

The product of its (nonzero) digits is 2688, while the sum is 31.

The square root of 81860701 is about 9047.6903682653. The cubic root of 81860701 is about 434.2020002280.

The spelling of 81860701 in words is "eighty-one million, eight hundred sixty thousand, seven hundred one".