2158305251 has 4 divisors (see below), whose sum is σ = 2232729600. Its totient is φ = 2083880904.

The previous prime is 2158305229. The next prime is 2158305263. The reversal of 2158305251 is 1525038512.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2158305251 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2158305221) 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, 37212131 + ... + 37212188.

It is an arithmetic number, because the mean of its divisors is an integer number (558182400).

Almost surely, 2^2158305251 is an apocalyptic number.

2158305251 is a deficient number, since it is larger than the sum of its proper divisors (74424349).

2158305251 is an equidigital number, since it uses as much as digits as its factorization.

2158305251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74424348.

The product of its (nonzero) digits is 12000, while the sum is 32.

The square root of 2158305251 is about 46457.5639804758. The cubic root of 2158305251 is about 1292.3226490768.

The spelling of 2158305251 in words is "two billion, one hundred fifty-eight million, three hundred five thousand, two hundred fifty-one".