77811081 has 4 divisors (see below), whose sum is σ = 103748112. Its totient is φ = 51874052.

The previous prime is 77811079. The next prime is 77811113. The reversal of 77811081 is 18011877.

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 77811081 - 2¹ = 77811079 is a prime.

It is a super-3 number, since 3×77811081³ (a number of 25 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is not an unprimeable number, because it can be changed into a prime (77811781) 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, 12968511 + ... + 12968516.

It is an arithmetic number, because the mean of its divisors is an integer number (25937028).

Almost surely, 2^77811081 is an apocalyptic number.

It is an amenable number.

77811081 is a deficient number, since it is larger than the sum of its proper divisors (25937031).

77811081 is a wasteful number, since it uses less digits than its factorization.

77811081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25937030.

The product of its (nonzero) digits is 3136, while the sum is 33.

The square root of 77811081 is about 8821.0589500354. The cubic root of 77811081 is about 426.9206378439.

The spelling of 77811081 in words is "seventy-seven million, eight hundred eleven thousand, eighty-one".