81523045 has 8 divisors (see below), whose sum is σ = 97883424. Its totient is φ = 65181264.

The previous prime is 81523037. The next prime is 81523067. The reversal of 81523045 is 54032518.

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

It is a cyclic number.

It is not a de Polignac number, because 81523045 - 2³ = 81523037 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8262 + ... + 15208.

It is an arithmetic number, because the mean of its divisors is an integer number (12235428).

Almost surely, 2^81523045 is an apocalyptic number.

It is an amenable number.

81523045 is a deficient number, since it is larger than the sum of its proper divisors (16360379).

81523045 is a wasteful number, since it uses less digits than its factorization.

81523045 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9299.

The product of its (nonzero) digits is 4800, while the sum is 28.

The square root of 81523045 is about 9029.0112969250. The cubic root of 81523045 is about 433.6041840581.

The spelling of 81523045 in words is "eighty-one million, five hundred twenty-three thousand, forty-five".