102797749 has 4 divisors (see below), whose sum is σ = 104483020. Its totient is φ = 101112480.

The previous prime is 102797689. The next prime is 102797777. The reversal of 102797749 is 947797201.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 947797201 = 13 ⋅72907477.

It can be written as a sum of positive squares in 2 ways, for example, as 4431025 + 98366724 = 2105^2 + 9918^2 .

It is a cyclic number.

It is not a de Polignac number, because 102797749 - 2⁹ = 102797237 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 102797699 and 102797708.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (102797449) 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, 842544 + ... + 842665.

It is an arithmetic number, because the mean of its divisors is an integer number (26120755).

Almost surely, 2^102797749 is an apocalyptic number.

It is an amenable number.

102797749 is a deficient number, since it is larger than the sum of its proper divisors (1685271).

102797749 is an equidigital number, since it uses as much as digits as its factorization.

102797749 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1685270.

The product of its (nonzero) digits is 222264, while the sum is 46.

The square root of 102797749 is about 10138.9224772655. The cubic root of 102797749 is about 468.4477977697.

The spelling of 102797749 in words is "one hundred two million, seven hundred ninety-seven thousand, seven hundred forty-nine".