81545035 has 48 divisors (see below), whose sum is σ = 119743488. Its totient is φ = 52790400.

The previous prime is 81545029. The next prime is 81545041. The reversal of 81545035 is 53054518.

It is an interprime number because it is at equal distance from previous prime (81545029) and next prime (81545041).

It is not a de Polignac number, because 81545035 - 2³ = 81545027 is a prime.

It is a super-4 number, since 4×81545035⁴ (a number of 33 digits) contains 4444 as substring.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 81544988 and 81545006.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 288004 + ... + 288286.

It is an arithmetic number, because the mean of its divisors is an integer number (2494656).

Almost surely, 2^81545035 is an apocalyptic number.

81545035 is a deficient number, since it is larger than the sum of its proper divisors (38198453).

81545035 is a wasteful number, since it uses less digits than its factorization.

81545035 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 356 (or 343 counting only the distinct ones).

The product of its (nonzero) digits is 12000, while the sum is 31.

The square root of 81545035 is about 9030.2289561229. The cubic root of 81545035 is about 433.6431673043.

The spelling of 81545035 in words is "eighty-one million, five hundred forty-five thousand, thirty-five".