81229953 has 8 divisors (see below), whose sum is σ = 123779008. Its totient is φ = 46417104.

The previous prime is 81229949. The next prime is 81229963. The reversal of 81229953 is 35992218.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 81229953 - 2² = 81229949 is a prime.

It is a super-3 number, since 3×81229953³ (a number of 25 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81229913) 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 7 ways as a sum of consecutive naturals, for example, 1934026 + ... + 1934067.

It is an arithmetic number, because the mean of its divisors is an integer number (15472376).

Almost surely, 2^81229953 is an apocalyptic number.

It is an amenable number.

81229953 is a deficient number, since it is larger than the sum of its proper divisors (42549055).

81229953 is a wasteful number, since it uses less digits than its factorization.

81229953 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3868103.

The product of its digits is 38880, while the sum is 39.

The square root of 81229953 is about 9012.7661125761. The cubic root of 81229953 is about 433.0839282115.

The spelling of 81229953 in words is "eighty-one million, two hundred twenty-nine thousand, nine hundred fifty-three".