102779485 has 4 divisors (see below), whose sum is σ = 123335388. Its totient is φ = 82223584.

The previous prime is 102779483. The next prime is 102779491. The reversal of 102779485 is 584977201.

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 36796356 + 65983129 = 6066^2 + 8123^2 .

It is a cyclic number.

It is not a de Polignac number, because 102779485 - 2¹ = 102779483 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 (102779483) 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 3 ways as a sum of consecutive naturals, for example, 10277944 + ... + 10277953.

It is an arithmetic number, because the mean of its divisors is an integer number (30833847).

Almost surely, 2^102779485 is an apocalyptic number.

It is an amenable number.

102779485 is a deficient number, since it is larger than the sum of its proper divisors (20555903).

102779485 is an equidigital number, since it uses as much as digits as its factorization.

102779485 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20555902.

The product of its (nonzero) digits is 141120, while the sum is 43.

The square root of 102779485 is about 10138.0217498287. The cubic root of 102779485 is about 468.4200532020.

The spelling of 102779485 in words is "one hundred two million, seven hundred seventy-nine thousand, four hundred eighty-five".