81326061 has 24 divisors (see below), whose sum is σ = 124953920. Its totient is φ = 50823936.

The previous prime is 81326059. The next prime is 81326107. The reversal of 81326061 is 16062318.

It is not a de Polignac number, because 81326061 - 2¹ = 81326059 is a prime.

It is a super-2 number, since 2×81326061² = 13227856395551442, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81326041) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 14136 + ... + 19038.

Almost surely, 2^81326061 is an apocalyptic number.

It is an amenable number.

81326061 is a deficient number, since it is larger than the sum of its proper divisors (43627859).

81326061 is a wasteful number, since it uses less digits than its factorization.

81326061 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5025 (or 5022 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 27.

The square root of 81326061 is about 9018.0963068710. The cubic root of 81326061 is about 433.2546633649.

Adding to 81326061 its reverse (16062318), we get a palindrome (97388379).

The spelling of 81326061 in words is "eighty-one million, three hundred twenty-six thousand, sixty-one".