2154171457 has 2 divisors, whose sum is σ = 2154171458. Its totient is φ = 2154171456.

The previous prime is 2154171451. The next prime is 2154171497. The reversal of 2154171457 is 7541714512.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1848656016 + 305515441 = 42996^2 + 17479^2 .

It is a cyclic number.

It is not a de Polignac number, because 2154171457 - 2³¹ = 6687809 is a prime.

It is not a weakly prime, because it can be changed into another prime (2154171451) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1077085728 + 1077085729.

It is an arithmetic number, because the mean of its divisors is an integer number (1077085729).

Almost surely, 2^2154171457 is an apocalyptic number.

It is an amenable number.

2154171457 is a deficient number, since it is larger than the sum of its proper divisors (1).

2154171457 is an equidigital number, since it uses as much as digits as its factorization.

2154171457 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 39200, while the sum is 37.

The square root of 2154171457 is about 46413.0526576307. The cubic root of 2154171457 is about 1291.4970615202.

Adding to 2154171457 its reverse (7541714512), we get a palindrome (9695885969).

The spelling of 2154171457 in words is "two billion, one hundred fifty-four million, one hundred seventy-one thousand, four hundred fifty-seven".