81897226 has 8 divisors (see below), whose sum is σ = 126808704. Its totient is φ = 39627660.

The previous prime is 81897223. The next prime is 81897229. The reversal of 81897226 is 62279818.

It is an interprime number because it is at equal distance from previous prime (81897223) and next prime (81897229).

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

It is not an unprimeable number, because it can be changed into a prime (81897223) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 660400 + ... + 660523.

It is an arithmetic number, because the mean of its divisors is an integer number (15851088).

Almost surely, 2^81897226 is an apocalyptic number.

81897226 is a deficient number, since it is larger than the sum of its proper divisors (44911478).

81897226 is a wasteful number, since it uses less digits than its factorization.

81897226 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1320956.

The product of its digits is 96768, while the sum is 43.

The square root of 81897226 is about 9049.7086140936. The cubic root of 81897226 is about 434.2665687358.

The spelling of 81897226 in words is "eighty-one million, eight hundred ninety-seven thousand, two hundred twenty-six".