2154251317 has 4 divisors (see below), whose sum is σ = 2154344256. Its totient is φ = 2154158380.

The previous prime is 2154251311. The next prime is 2154251371. The reversal of 2154251317 is 7131524512.

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, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2154251317 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2154251311) 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, 19842 + ... + 68572.

It is an arithmetic number, because the mean of its divisors is an integer number (538586064).

Almost surely, 2^2154251317 is an apocalyptic number.

It is an amenable number.

2154251317 is a deficient number, since it is larger than the sum of its proper divisors (92939).

2154251317 is an equidigital number, since it uses as much as digits as its factorization.

2154251317 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 92938.

The product of its digits is 8400, while the sum is 31.

The square root of 2154251317 is about 46413.9129679884. The cubic root of 2154251317 is about 1291.5130208937.

Adding to 2154251317 its reverse (7131524512), we get a palindrome (9285775829).

The spelling of 2154251317 in words is "two billion, one hundred fifty-four million, two hundred fifty-one thousand, three hundred seventeen".