81219083 has 16 divisors (see below), whose sum is σ = 90097920. Its totient is φ = 72602400.

The previous prime is 81219079. The next prime is 81219113. The reversal of 81219083 is 38091218.

It is a cyclic number.

It is not a de Polignac number, because 81219083 - 2² = 81219079 is a prime.

It is not an unprimeable number, because it can be changed into a prime (81219283) 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, 226058 + ... + 226416.

It is an arithmetic number, because the mean of its divisors is an integer number (5631120).

Almost surely, 2^81219083 is an apocalyptic number.

81219083 is a deficient number, since it is larger than the sum of its proper divisors (8878837).

81219083 is a wasteful number, since it uses less digits than its factorization.

81219083 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 658.

The product of its (nonzero) digits is 3456, while the sum is 32.

The square root of 81219083 is about 9012.1630588888. The cubic root of 81219083 is about 433.0646092611.

The spelling of 81219083 in words is "eighty-one million, two hundred nineteen thousand, eighty-three".