102779 has 4 divisors (see below), whose sum is σ = 104160. Its totient is φ = 101400.

The previous prime is 102769. The next prime is 102793. The reversal of 102779 is 977201.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 977201 = 23 ⋅42487.

It is a cyclic number.

It is not a de Polignac number, because 102779 - 2⁴ = 102763 is a prime.

It is a fibodiv number, since the Fibonacci-like sequence with seeds 1027 and 79 contains 102779 itself.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (102769) 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, 572 + ... + 729.

It is an arithmetic number, because the mean of its divisors is an integer number (26040).

2¹⁰²⁷⁷⁹ is an apocalyptic number.

102779 is a deficient number, since it is larger than the sum of its proper divisors (1381).

102779 is an equidigital number, since it uses as much as digits as its factorization.

102779 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1380.

The product of its (nonzero) digits is 882, while the sum is 26.

The square root of 102779 is about 320.5916405648. The cubic root of 102779 is about 46.8419316401.

The spelling of 102779 in words is "one hundred two thousand, seven hundred seventy-nine".