81970107 has 32 divisors (see below), whose sum is σ = 120637440. Its totient is φ = 49282560.

The previous prime is 81970093. The next prime is 81970127. The reversal of 81970107 is 70107918.

It is not a de Polignac number, because 81970107 - 2²³ = 73581499 is a prime.

It is not an unprimeable number, because it can be changed into a prime (81970127) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 219573 + ... + 219945.

It is an arithmetic number, because the mean of its divisors is an integer number (3769920).

Almost surely, 2^81970107 is an apocalyptic number.

81970107 is a deficient number, since it is larger than the sum of its proper divisors (38667333).

81970107 is a wasteful number, since it uses less digits than its factorization.

81970107 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 563.

The product of its (nonzero) digits is 3528, while the sum is 33.

The square root of 81970107 is about 9053.7344228777. The cubic root of 81970107 is about 434.3953496462.

The spelling of 81970107 in words is "eighty-one million, nine hundred seventy thousand, one hundred seven".