81206000234 has 4 divisors (see below), whose sum is σ = 121809000354. Its totient is φ = 40603000116.

The previous prime is 81206000179. The next prime is 81206000279. The reversal of 81206000234 is 43200060218.

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

It can be written as a sum of positive squares in only one way, i.e., 48861776209 + 32344224025 = 221047^2 + 179845^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20301500057 + ... + 20301500060.

Almost surely, 2^81206000234 is an apocalyptic number.

81206000234 is a deficient number, since it is larger than the sum of its proper divisors (40603000120).

81206000234 is a wasteful number, since it uses less digits than its factorization.

81206000234 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40603000119.

The product of its (nonzero) digits is 2304, while the sum is 26.

The spelling of 81206000234 in words is "eighty-one billion, two hundred six million, two hundred thirty-four", and thus it is an aban number.