2145440251 has 8 divisors (see below), whose sum is σ = 2219109984. Its totient is φ = 2072786880.

The previous prime is 2145440243. The next prime is 2145440257. The reversal of 2145440251 is 1520445412.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2145440251 - 2³ = 2145440243 is a prime.

It is a super-2 number, since 2×2145440251² = 9205827741221886002, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2145440257) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 249796 + ... + 258241.

It is an arithmetic number, because the mean of its divisors is an integer number (277388748).

Almost surely, 2^2145440251 is an apocalyptic number.

2145440251 is a deficient number, since it is larger than the sum of its proper divisors (73669733).

2145440251 is a wasteful number, since it uses less digits than its factorization.

2145440251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 508181.

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

The square root of 2145440251 is about 46318.8973422296. The cubic root of 2145440251 is about 1289.7498164745.

Adding to 2145440251 its reverse (1520445412), we get a palindrome (3665885663).

The spelling of 2145440251 in words is "two billion, one hundred forty-five million, four hundred forty thousand, two hundred fifty-one".