81261334 has 16 divisors (see below), whose sum is σ = 151969536. Its totient is φ = 31660200.

The previous prime is 81261329. The next prime is 81261379. The reversal of 81261334 is 43316218.

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, 263682 + ... + 263989.

It is an arithmetic number, because the mean of its divisors is an integer number (9498096).

Almost surely, 2^81261334 is an apocalyptic number.

81261334 is a deficient number, since it is larger than the sum of its proper divisors (70708202).

81261334 is a wasteful number, since it uses less digits than its factorization.

81261334 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 527691.

The product of its digits is 3456, while the sum is 28.

The square root of 81261334 is about 9014.5068639388. The cubic root of 81261334 is about 433.1396911269.

Subtracting from 81261334 its reverse (43316218), we obtain a triangular number (37945116 = T₈₇₁₁).

The spelling of 81261334 in words is "eighty-one million, two hundred sixty-one thousand, three hundred thirty-four".