81233949 has 32 divisors (see below), whose sum is σ = 117504000. Its totient is φ = 49762944.

The previous prime is 81233941. The next prime is 81233969. The reversal of 81233949 is 94933218.

It is not a de Polignac number, because 81233949 - 2³ = 81233941 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81233941) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 339772 + ... + 340010.

It is an arithmetic number, because the mean of its divisors is an integer number (3672000).

Almost surely, 2^81233949 is an apocalyptic number.

81233949 is a gapful number since it is divisible by the number (89) formed by its first and last digit.

It is an amenable number.

81233949 is a deficient number, since it is larger than the sum of its proper divisors (36270051).

81233949 is a wasteful number, since it uses less digits than its factorization.

81233949 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 417.

The product of its digits is 46656, while the sum is 39.

The square root of 81233949 is about 9012.9877953984. The cubic root of 81233949 is about 433.0910297585.

The spelling of 81233949 in words is "eighty-one million, two hundred thirty-three thousand, nine hundred forty-nine".