2102939749 has 4 divisors (see below), whose sum is σ = 2194371936. Its totient is φ = 2011507564.

The previous prime is 2102939723. The next prime is 2102939759. The reversal of 2102939749 is 9479392012.

It is a happy number.

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.

It is a cyclic number.

It is not a de Polignac number, because 2102939749 - 2⁷ = 2102939621 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2102939699 and 2102939708.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2102939759) 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, 45716059 + ... + 45716104.

It is an arithmetic number, because the mean of its divisors is an integer number (548592984).

Almost surely, 2^2102939749 is an apocalyptic number.

It is an amenable number.

2102939749 is a deficient number, since it is larger than the sum of its proper divisors (91432187).

2102939749 is an equidigital number, since it uses as much as digits as its factorization.

2102939749 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 91432186.

The product of its (nonzero) digits is 244944, while the sum is 46.

The square root of 2102939749 is about 45857.8210232453. The cubic root of 2102939749 is about 1281.1764389605.

The spelling of 2102939749 in words is "two billion, one hundred two million, nine hundred thirty-nine thousand, seven hundred forty-nine".