81146711 has 4 divisors (see below), whose sum is σ = 81178152. Its totient is φ = 81115272.

The previous prime is 81146707. The next prime is 81146731. The reversal of 81146711 is 11764118.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 11764118 = 2 ⋅5882059.

It is a cyclic number.

It is not a de Polignac number, because 81146711 - 2² = 81146707 is a prime.

It is a super-2 number, since 2×81146711² = 13169577412235042, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81146731) 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, 11465 + ... + 17138.

It is an arithmetic number, because the mean of its divisors is an integer number (20294538).

Almost surely, 2^81146711 is an apocalyptic number.

81146711 is a deficient number, since it is larger than the sum of its proper divisors (31441).

81146711 is a wasteful number, since it uses less digits than its factorization.

81146711 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31440.

The product of its digits is 1344, while the sum is 29.

The square root of 81146711 is about 9008.1469237574. The cubic root of 81146711 is about 432.9359405435.

The spelling of 81146711 in words is "eighty-one million, one hundred forty-six thousand, seven hundred eleven".