81410761 has 4 divisors (see below), whose sum is σ = 81430272. Its totient is φ = 81391252.

The previous prime is 81410759. The next prime is 81410779. The reversal of 81410761 is 16701418.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 81410761 - 2¹ = 81410759 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 (81414761) 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, 685 + ... + 12778.

It is an arithmetic number, because the mean of its divisors is an integer number (20357568).

Almost surely, 2^81410761 is an apocalyptic number.

It is an amenable number.

81410761 is a deficient number, since it is larger than the sum of its proper divisors (19511).

81410761 is a wasteful number, since it uses less digits than its factorization.

81410761 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19510.

The product of its (nonzero) digits is 1344, while the sum is 28.

The square root of 81410761 is about 9022.7911978500. The cubic root of 81410761 is about 433.4050208158.

The spelling of 81410761 in words is "eighty-one million, four hundred ten thousand, seven hundred sixty-one".