2120879749 has 4 divisors (see below), whose sum is σ = 2213091936. Its totient is φ = 2028667564.

The previous prime is 2120879729. The next prime is 2120879767. The reversal of 2120879749 is 9479780212.

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 2120879749 - 2¹¹ = 2120877701 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 (2120879729) 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, 46106059 + ... + 46106104.

It is an arithmetic number, because the mean of its divisors is an integer number (553272984).

Almost surely, 2^2120879749 is an apocalyptic number.

It is an amenable number.

2120879749 is a deficient number, since it is larger than the sum of its proper divisors (92212187).

2120879749 is an equidigital number, since it uses as much as digits as its factorization.

2120879749 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 92212186.

The product of its (nonzero) digits is 508032, while the sum is 49.

The square root of 2120879749 is about 46053.0102056315. The cubic root of 2120879749 is about 1284.8093302162.

The spelling of 2120879749 in words is "two billion, one hundred twenty million, eight hundred seventy-nine thousand, seven hundred forty-nine".