81031045 has 8 divisors (see below), whose sum is σ = 97320960. Its totient is φ = 64769040.

The previous prime is 81031043. The next prime is 81031051. The reversal of 81031045 is 54013018.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 81031045 - 2¹ = 81031043 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81031043) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 60 + ... + 12730.

It is an arithmetic number, because the mean of its divisors is an integer number (12165120).

Almost surely, 2^81031045 is an apocalyptic number.

It is an amenable number.

81031045 is a deficient number, since it is larger than the sum of its proper divisors (16289915).

81031045 is a wasteful number, since it uses less digits than its factorization.

81031045 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13955.

The product of its (nonzero) digits is 480, while the sum is 22.

The square root of 81031045 is about 9001.7245569946. The cubic root of 81031045 is about 432.7301413624.

The spelling of 81031045 in words is "eighty-one million, thirty-one thousand, forty-five".