81955735 has 4 divisors (see below), whose sum is σ = 98346888. Its totient is φ = 65564584.

The previous prime is 81955717. The next prime is 81955747. The reversal of 81955735 is 53755918.

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

It is a cyclic number.

It is not a de Polignac number, because 81955735 - 2¹³ = 81947543 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 81955691 and 81955700.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8195569 + ... + 8195578.

It is an arithmetic number, because the mean of its divisors is an integer number (24586722).

Almost surely, 2^81955735 is an apocalyptic number.

81955735 is a deficient number, since it is larger than the sum of its proper divisors (16391153).

81955735 is a wasteful number, since it uses less digits than its factorization.

81955735 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16391152.

The product of its digits is 189000, while the sum is 43.

The square root of 81955735 is about 9052.9406824523. The cubic root of 81955735 is about 434.3699603301.

The spelling of 81955735 in words is "eighty-one million, nine hundred fifty-five thousand, seven hundred thirty-five".