2100345749 has 4 divisors (see below), whose sum is σ = 2100696780. Its totient is φ = 2099994720.

The previous prime is 2100345713. The next prime is 2100345781. The reversal of 2100345749 is 9475430012.

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 859545124 + 1240800625 = 29318^2 + 35225^2 .

It is a cyclic number.

It is not a de Polignac number, because 2100345749 - 2²⁴ = 2083568533 is a prime.

It is a super-2 number, since 2×2100345749² = 8822904530684742002, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2100347749) 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, 166382 + ... + 178559.

It is an arithmetic number, because the mean of its divisors is an integer number (525174195).

Almost surely, 2^2100345749 is an apocalyptic number.

It is an amenable number.

2100345749 is a deficient number, since it is larger than the sum of its proper divisors (351031).

2100345749 is an equidigital number, since it uses as much as digits as its factorization.

2100345749 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 351030.

The product of its (nonzero) digits is 30240, while the sum is 35.

The square root of 2100345749 is about 45829.5292251622. The cubic root of 2100345749 is about 1280.6494403318.

The spelling of 2100345749 in words is "two billion, one hundred million, three hundred forty-five thousand, seven hundred forty-nine".