81970106 has 8 divisors (see below), whose sum is σ = 123894144. Its totient is φ = 40672060.

The previous prime is 81970093. The next prime is 81970127. The reversal of 81970106 is 60107918.

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 156170 + ... + 156693.

It is an arithmetic number, because the mean of its divisors is an integer number (15486768).

Almost surely, 2^81970106 is an apocalyptic number.

81970106 is a deficient number, since it is larger than the sum of its proper divisors (41924038).

81970106 is a wasteful number, since it uses less digits than its factorization.

81970106 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 312996.

The product of its (nonzero) digits is 3024, while the sum is 32.

The square root of 81970106 is about 9053.7343676518. The cubic root of 81970106 is about 434.3953478797.

The spelling of 81970106 in words is "eighty-one million, nine hundred seventy thousand, one hundred six".