102749489 has 4 divisors (see below), whose sum is σ = 105139056. Its totient is φ = 100359924.

The previous prime is 102749483. The next prime is 102749501. The reversal of 102749489 is 984947201.

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, and also an emirpimes, since its reverse is a distinct semiprime: 984947201 = 7 ⋅140706743.

It is a cyclic number.

It is not a de Polignac number, because 102749489 - 2¹⁶ = 102683953 is a prime.

It is a super-2 number, since 2×102749489² = 21114914979522242, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (102749483) 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, 1194719 + ... + 1194804.

It is an arithmetic number, because the mean of its divisors is an integer number (26284764).

Almost surely, 2^102749489 is an apocalyptic number.

It is an amenable number.

102749489 is a deficient number, since it is larger than the sum of its proper divisors (2389567).

102749489 is an equidigital number, since it uses as much as digits as its factorization.

102749489 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2389566.

The product of its (nonzero) digits is 145152, while the sum is 44.

The square root of 102749489 is about 10136.5422605541. The cubic root of 102749489 is about 468.3744795967.

The spelling of 102749489 in words is "one hundred two million, seven hundred forty-nine thousand, four hundred eighty-nine".