81416445 has 16 divisors (see below), whose sum is σ = 142108992. Its totient is φ = 39474560.

The previous prime is 81416441. The next prime is 81416449. The reversal of 81416445 is 54461418.

It is an interprime number because it is at equal distance from previous prime (81416441) and next prime (81416449).

It is not a de Polignac number, because 81416445 - 2² = 81416441 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81416441) 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, 246552 + ... + 246881.

It is an arithmetic number, because the mean of its divisors is an integer number (8881812).

Almost surely, 2^81416445 is an apocalyptic number.

It is an amenable number.

81416445 is a deficient number, since it is larger than the sum of its proper divisors (60692547).

81416445 is a wasteful number, since it uses less digits than its factorization.

81416445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 493452.

The product of its digits is 15360, while the sum is 33.

The square root of 81416445 is about 9023.1061724885. The cubic root of 81416445 is about 433.4151071843.

The spelling of 81416445 in words is "eighty-one million, four hundred sixteen thousand, four hundred forty-five".