2142969749 has 4 divisors (see below), whose sum is σ = 2143242636. Its totient is φ = 2142696864.

The previous prime is 2142969733. The next prime is 2142969797. The reversal of 2142969749 is 9479692412.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1468269124 + 674700625 = 38318^2 + 25975^2 .

It is a cyclic number.

It is not a de Polignac number, because 2142969749 - 2⁴ = 2142969733 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2142969749.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2142969449) 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, 124304 + ... + 140489.

It is an arithmetic number, because the mean of its divisors is an integer number (535810659).

Almost surely, 2^2142969749 is an apocalyptic number.

It is an amenable number.

2142969749 is a deficient number, since it is larger than the sum of its proper divisors (272887).

2142969749 is an equidigital number, since it uses as much as digits as its factorization.

2142969749 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 272886.

The product of its digits is 1959552, while the sum is 53.

The square root of 2142969749 is about 46292.2212580040. The cubic root of 2142969749 is about 1289.2545718402.

The spelling of 2142969749 in words is "two billion, one hundred forty-two million, nine hundred sixty-nine thousand, seven hundred forty-nine".