251540241 has 16 divisors (see below), whose sum is σ = 338309760. Its totient is φ = 166239360.

The previous prime is 251540227. The next prime is 251540249. The reversal of 251540241 is 142045152.

It is not a de Polignac number, because 251540241 - 2¹¹ = 251538193 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (251540249) 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, 192396 + ... + 193698.

It is an arithmetic number, because the mean of its divisors is an integer number (21144360).

Almost surely, 2^251540241 is an apocalyptic number.

It is an amenable number.

251540241 is a deficient number, since it is larger than the sum of its proper divisors (86769519).

251540241 is a wasteful number, since it uses less digits than its factorization.

251540241 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1816.

The product of its (nonzero) digits is 1600, while the sum is 24.

The square root of 251540241 is about 15860.0202080577. The cubic root of 251540241 is about 631.2515985190.

Adding to 251540241 its reverse (142045152), we get a palindrome (393585393).

The spelling of 251540241 in words is "two hundred fifty-one million, five hundred forty thousand, two hundred forty-one".