251140001 has 4 divisors (see below), whose sum is σ = 287017152. Its totient is φ = 215262852.

The previous prime is 251139983. The next prime is 251140009. The reversal of 251140001 is 100041152.

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.

It is not a de Polignac number, because 251140001 - 2¹⁴ = 251123617 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (251140009) 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, 17938565 + ... + 17938578.

It is an arithmetic number, because the mean of its divisors is an integer number (71754288).

Almost surely, 2^251140001 is an apocalyptic number.

It is an amenable number.

251140001 is a deficient number, since it is larger than the sum of its proper divisors (35877151).

251140001 is an equidigital number, since it uses as much as digits as its factorization.

251140001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35877150.

The product of its (nonzero) digits is 40, while the sum is 14.

The square root of 251140001 is about 15847.3972941931. The cubic root of 251140001 is about 630.9166139980.

Adding to 251140001 its reverse (100041152), we get a palindrome (351181153).

The spelling of 251140001 in words is "two hundred fifty-one million, one hundred forty thousand, one".