81070935 has 16 divisors (see below), whose sum is σ = 141505920. Its totient is φ = 39307040.

The previous prime is 81070931. The next prime is 81070937. The reversal of 81070935 is 53907018.

It is not a de Polignac number, because 81070935 - 2² = 81070931 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a junction number, because it is equal to n+sod(n) for n = 81070896 and 81070905.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81070931) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 245505 + ... + 245834.

It is an arithmetic number, because the mean of its divisors is an integer number (8844120).

Almost surely, 2^81070935 is an apocalyptic number.

81070935 is a deficient number, since it is larger than the sum of its proper divisors (60434985).

81070935 is a wasteful number, since it uses less digits than its factorization.

81070935 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 491358.

The product of its (nonzero) digits is 7560, while the sum is 33.

The square root of 81070935 is about 9003.9399709238. The cubic root of 81070935 is about 432.8011379111.

The spelling of 81070935 in words is "eighty-one million, seventy thousand, nine hundred thirty-five".