81201045 has 16 divisors (see below), whose sum is σ = 130148352. Its totient is φ = 43231680.

The previous prime is 81200963. The next prime is 81201049. The reversal of 81201045 is 54010218.

It is not a de Polignac number, because 81201045 - 2¹⁸ = 80938901 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81201049) 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, 4780 + ... + 13610.

It is an arithmetic number, because the mean of its divisors is an integer number (8134272).

Almost surely, 2^81201045 is an apocalyptic number.

It is an amenable number.

81201045 is a deficient number, since it is larger than the sum of its proper divisors (48947307).

81201045 is a wasteful number, since it uses less digits than its factorization.

81201045 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9452.

The product of its (nonzero) digits is 320, while the sum is 21.

The square root of 81201045 is about 9011.1622446830. The cubic root of 81201045 is about 433.0325470186.

The spelling of 81201045 in words is "eighty-one million, two hundred one thousand, forty-five".