81371702 has 4 divisors (see below), whose sum is σ = 122057556. Its totient is φ = 40685850.

The previous prime is 81371671. The next prime is 81371747. The reversal of 81371702 is 20717318.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 20342924 + ... + 20342927.

It is an arithmetic number, because the mean of its divisors is an integer number (30514389).

Almost surely, 2^81371702 is an apocalyptic number.

81371702 is a deficient number, since it is larger than the sum of its proper divisors (40685854).

81371702 is a wasteful number, since it uses less digits than its factorization.

81371702 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40685853.

The product of its (nonzero) digits is 2352, while the sum is 29.

The square root of 81371702 is about 9020.6264749185. The cubic root of 81371702 is about 433.3356971600.

The spelling of 81371702 in words is "eighty-one million, three hundred seventy-one thousand, seven hundred two".