81897134 has 16 divisors (see below), whose sum is σ = 134822016. Its totient is φ = 37001400.

The previous prime is 81897119. The next prime is 81897149. The reversal of 81897134 is 43179818.

It is an interprime number because it is at equal distance from previous prime (81897119) and next prime (81897149).

It is a junction number, because it is equal to n+sod(n) for n = 81897091 and 81897100.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7472 + ... + 14819.

It is an arithmetic number, because the mean of its divisors is an integer number (8426376).

Almost surely, 2^81897134 is an apocalyptic number.

81897134 is a deficient number, since it is larger than the sum of its proper divisors (52924882).

81897134 is a wasteful number, since it uses less digits than its factorization.

81897134 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22471.

The product of its digits is 48384, while the sum is 41.

The square root of 81897134 is about 9049.7035310556. The cubic root of 81897134 is about 434.2664061233.

The spelling of 81897134 in words is "eighty-one million, eight hundred ninety-seven thousand, one hundred thirty-four".