81732949 has 4 divisors (see below), whose sum is σ = 81767680. Its totient is φ = 81698220.

The previous prime is 81732941. The next prime is 81732979. The reversal of 81732949 is 94923718.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 94923718 = 2 ⋅47461859.

It is a cyclic number.

It is not a de Polignac number, because 81732949 - 2³ = 81732941 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81732941) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13557 + ... + 18634.

It is an arithmetic number, because the mean of its divisors is an integer number (20441920).

Almost surely, 2^81732949 is an apocalyptic number.

It is an amenable number.

81732949 is a deficient number, since it is larger than the sum of its proper divisors (34731).

81732949 is a wasteful number, since it uses less digits than its factorization.

81732949 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34730.

The product of its digits is 108864, while the sum is 43.

The square root of 81732949 is about 9040.6276883854. The cubic root of 81732949 is about 433.9760104106.

The spelling of 81732949 in words is "eighty-one million, seven hundred thirty-two thousand, nine hundred forty-nine".