76811491 has 16 divisors (see below), whose sum is σ = 83891808. Its totient is φ = 70041600.

The previous prime is 76811477. The next prime is 76811503. The reversal of 76811491 is 19411867.

It is a 14-Lehmer number, since φ(76811491) divides (76811491-1)¹⁴.

It is a cyclic number.

It is not a de Polignac number, because 76811491 - 2¹³ = 76803299 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 76811491.

It is not an unprimeable number, because it can be changed into a prime (76811431) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 134236 + ... + 134806.

It is an arithmetic number, because the mean of its divisors is an integer number (5243238).

Almost surely, 2^76811491 is an apocalyptic number.

76811491 is a deficient number, since it is larger than the sum of its proper divisors (7080317).

76811491 is a wasteful number, since it uses less digits than its factorization.

76811491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 822.

The product of its digits is 12096, while the sum is 37.

The square root of 76811491 is about 8764.2165080514. The cubic root of 76811491 is about 425.0846262853.

The spelling of 76811491 in words is "seventy-six million, eight hundred eleven thousand, four hundred ninety-one".