2120649451 has 4 divisors (see below), whose sum is σ = 2232262600. Its totient is φ = 2009036304.

The previous prime is 2120649431. The next prime is 2120649467. The reversal of 2120649451 is 1549460212.

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

It is a cyclic number.

It is not a de Polignac number, because 2120649451 - 2⁹ = 2120648939 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2120649431) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 55806546 + ... + 55806583.

It is an arithmetic number, because the mean of its divisors is an integer number (558065650).

Almost surely, 2^2120649451 is an apocalyptic number.

2120649451 is a deficient number, since it is larger than the sum of its proper divisors (111613149).

2120649451 is a wasteful number, since it uses less digits than its factorization.

2120649451 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 111613148.

The product of its (nonzero) digits is 17280, while the sum is 34.

The square root of 2120649451 is about 46050.5097800231. The cubic root of 2120649451 is about 1284.7628244002.

The spelling of 2120649451 in words is "two billion, one hundred twenty million, six hundred forty-nine thousand, four hundred fifty-one".