81833997 has 32 divisors (see below), whose sum is σ = 127125504. Its totient is φ = 45864000.

The previous prime is 81833989. The next prime is 81834037. The reversal of 81833997 is 79933818.

It is not a de Polignac number, because 81833997 - 2³ = 81833989 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81833897) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 415303 + ... + 415499.

It is an arithmetic number, because the mean of its divisors is an integer number (3972672).

Almost surely, 2^81833997 is an apocalyptic number.

It is an amenable number.

81833997 is a deficient number, since it is larger than the sum of its proper divisors (45291507).

81833997 is a wasteful number, since it uses less digits than its factorization.

81833997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 489.

The product of its digits is 326592, while the sum is 48.

The square root of 81833997 is about 9046.2145121592. The cubic root of 81833997 is about 434.1547810247.

The spelling of 81833997 in words is "eighty-one million, eight hundred thirty-three thousand, nine hundred ninety-seven".