2154242251 has 16 divisors (see below), whose sum is σ = 2545252864. Its totient is φ = 1784934144.

The previous prime is 2154242221. The next prime is 2154242263. The reversal of 2154242251 is 1522424512.

It is a happy number.

It is not a de Polignac number, because 2154242251 - 2¹¹ = 2154240203 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2154242221) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7695 + ... + 66088.

It is an arithmetic number, because the mean of its divisors is an integer number (159078304).

Almost surely, 2^2154242251 is an apocalyptic number.

2154242251 is a deficient number, since it is larger than the sum of its proper divisors (391010613).

2154242251 is an equidigital number, since it uses as much as digits as its factorization.

2154242251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73930.

The product of its digits is 6400, while the sum is 28.

The square root of 2154242251 is about 46413.8153032047. The cubic root of 2154242251 is about 1291.5112091470.

Adding to 2154242251 its reverse (1522424512), we get a palindrome (3676666763).

The spelling of 2154242251 in words is "two billion, one hundred fifty-four million, two hundred forty-two thousand, two hundred fifty-one".