81261234 has 12 divisors (see below), whose sum is σ = 176066046. Its totient is φ = 27087072.

The previous prime is 81261209. The next prime is 81261239. The reversal of 81261234 is 43216218.

81261234 is a `hidden beast` number, since 8 + 12 + 612 + 34 = 666.

It can be written as a sum of positive squares in only one way, i.e., 64883025 + 16378209 = 8055^2 + 4047^2 .

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 81261198 and 81261207.

It is not an unprimeable number, because it can be changed into a prime (81261239) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2257239 + ... + 2257274.

Almost surely, 2^81261234 is an apocalyptic number.

81261234 is an abundant number, since it is smaller than the sum of its proper divisors (94804812).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

81261234 is a wasteful number, since it uses less digits than its factorization.

81261234 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4514521 (or 4514518 counting only the distinct ones).

The product of its digits is 2304, while the sum is 27.

The square root of 81261234 is about 9014.5013173220. The cubic root of 81261234 is about 433.1395134533.

The spelling of 81261234 in words is "eighty-one million, two hundred sixty-one thousand, two hundred thirty-four".