2142279749 has 4 divisors (see below), whose sum is σ = 2142513600. Its totient is φ = 2142045900.

The previous prime is 2142279743. The next prime is 2142279757. The reversal of 2142279749 is 9479722412.

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 2142279749 - 2²⁰ = 2141231173 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 (2142279743) 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, 102599 + ... + 121700.

It is an arithmetic number, because the mean of its divisors is an integer number (535628400).

Almost surely, 2^2142279749 is an apocalyptic number.

It is an amenable number.

2142279749 is a deficient number, since it is larger than the sum of its proper divisors (233851).

2142279749 is an equidigital number, since it uses as much as digits as its factorization.

2142279749 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 233850.

The product of its digits is 508032, while the sum is 47.

The square root of 2142279749 is about 46284.7680020112. The cubic root of 2142279749 is about 1289.1161842670.

The spelling of 2142279749 in words is "two billion, one hundred forty-two million, two hundred seventy-nine thousand, seven hundred forty-nine".