81058761 has 12 divisors (see below), whose sum is σ = 133811392. Its totient is φ = 46319256.

The previous prime is 81058753. The next prime is 81058781. The reversal of 81058761 is 16785018.

81058761 is a `hidden beast` number, since 8 + 10 + 587 + 61 = 666.

It is not a de Polignac number, because 81058761 - 2³ = 81058753 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81058711) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 643261 + ... + 643386.

Almost surely, 2^81058761 is an apocalyptic number.

It is an amenable number.

81058761 is a deficient number, since it is larger than the sum of its proper divisors (52752631).

81058761 is a wasteful number, since it uses less digits than its factorization.

81058761 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1286660 (or 1286657 counting only the distinct ones).

The product of its (nonzero) digits is 13440, while the sum is 36.

The square root of 81058761 is about 9003.2639081613. The cubic root of 81058761 is about 432.7794729958.

The spelling of 81058761 in words is "eighty-one million, fifty-eight thousand, seven hundred sixty-one".