77554109 has 4 divisors (see below), whose sum is σ = 79650204. Its totient is φ = 75458016.

The previous prime is 77554097. The next prime is 77554111. The reversal of 77554109 is 90145577.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 51768025 + 25786084 = 7195^2 + 5078^2 .

It is a cyclic number.

It is not a de Polignac number, because 77554109 - 2⁴ = 77554093 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77554129) 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, 1047992 + ... + 1048065.

It is an arithmetic number, because the mean of its divisors is an integer number (19912551).

Almost surely, 2^77554109 is an apocalyptic number.

It is an amenable number.

77554109 is a deficient number, since it is larger than the sum of its proper divisors (2096095).

77554109 is a wasteful number, since it uses less digits than its factorization.

77554109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2096094.

The product of its (nonzero) digits is 44100, while the sum is 38.

The square root of 77554109 is about 8806.4810792961. The cubic root of 77554109 is about 426.4501494080.

The spelling of 77554109 in words is "seventy-seven million, five hundred fifty-four thousand, one hundred nine".