2151020647 has 4 divisors (see below), whose sum is σ = 2264232280. Its totient is φ = 2037809016.

The previous prime is 2151020629. The next prime is 2151020689. The reversal of 2151020647 is 7460201512.

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 2151020647 - 2¹¹ = 2151018599 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2151020147) 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, 56605788 + ... + 56605825.

It is an arithmetic number, because the mean of its divisors is an integer number (566058070).

Almost surely, 2^2151020647 is an apocalyptic number.

2151020647 is a deficient number, since it is larger than the sum of its proper divisors (113211633).

2151020647 is a wasteful number, since it uses less digits than its factorization.

2151020647 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 113211632.

The product of its (nonzero) digits is 3360, while the sum is 28.

The square root of 2151020647 is about 46379.0970912544. The cubic root of 2151020647 is about 1290.8670826587.

The spelling of 2151020647 in words is "two billion, one hundred fifty-one million, twenty thousand, six hundred forty-seven".