81145701 has 24 divisors (see below), whose sum is σ = 144260480. Its totient is φ = 42801696.

The previous prime is 81145651. The next prime is 81145717. The reversal of 81145701 is 10754118.

81145701 is a `hidden beast` number, since 81 + 14 + 570 + 1 = 666.

It is not a de Polignac number, because 81145701 - 2¹⁰ = 81144677 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81145721) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 48721 + ... + 50358.

Almost surely, 2^81145701 is an apocalyptic number.

It is an amenable number.

81145701 is a deficient number, since it is larger than the sum of its proper divisors (63114779).

81145701 is a wasteful number, since it uses less digits than its factorization.

81145701 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 99105 (or 99102 counting only the distinct ones).

The product of its (nonzero) digits is 1120, while the sum is 27.

The square root of 81145701 is about 9008.0908632185. The cubic root of 81145701 is about 432.9341443437.

Adding to 81145701 its reverse (10754118), we get a palindrome (91899819).

The spelling of 81145701 in words is "eighty-one million, one hundred forty-five thousand, seven hundred one".