81147962 has 16 divisors (see below), whose sum is σ = 140000640. Its totient is φ = 34555248.

The previous prime is 81147961. The next prime is 81147973. The reversal of 81147962 is 26974118.

It is not an unprimeable number, because it can be changed into a prime (81147961) 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, 16262 + ... + 20657.

It is an arithmetic number, because the mean of its divisors is an integer number (8750040).

Almost surely, 2^81147962 is an apocalyptic number.

81147962 is a deficient number, since it is larger than the sum of its proper divisors (58852678).

81147962 is a wasteful number, since it uses less digits than its factorization.

81147962 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37085.

The product of its digits is 24192, while the sum is 38.

The square root of 81147962 is about 9008.2163606343. The cubic root of 81147962 is about 432.9381653208.

The spelling of 81147962 in words is "eighty-one million, one hundred forty-seven thousand, nine hundred sixty-two".