2156857073 has 4 divisors (see below), whose sum is σ = 2464979520. Its totient is φ = 1848734628.

The previous prime is 2156857069. The next prime is 2156857097. The reversal of 2156857073 is 3707586512.

It is a happy number.

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 2156857073 - 2² = 2156857069 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2156857673) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 154061213 + ... + 154061226.

It is an arithmetic number, because the mean of its divisors is an integer number (616244880).

Almost surely, 2^2156857073 is an apocalyptic number.

It is an amenable number.

2156857073 is a deficient number, since it is larger than the sum of its proper divisors (308122447).

2156857073 is an equidigital number, since it uses as much as digits as its factorization.

2156857073 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 308122446.

The product of its (nonzero) digits is 352800, while the sum is 44.

The square root of 2156857073 is about 46441.9753348197. The cubic root of 2156857073 is about 1292.0335438530.

The spelling of 2156857073 in words is "two billion, one hundred fifty-six million, eight hundred fifty-seven thousand, seventy-three".