251241205145 has 32 divisors (see below), whose sum is σ = 347390816256. Its totient is φ = 170865489600.

The previous prime is 251241205139. The next prime is 251241205151. The reversal of 251241205145 is 541502142152.

It is an interprime number because it is at equal distance from previous prime (251241205139) and next prime (251241205151).

It is not a de Polignac number, because 251241205145 - 2⁴ = 251241205129 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 8380172 + ... + 8410098.

It is an arithmetic number, because the mean of its divisors is an integer number (10855963008).

Almost surely, 2^251241205145 is an apocalyptic number.

It is an amenable number.

251241205145 is a deficient number, since it is larger than the sum of its proper divisors (96149611111).

251241205145 is a wasteful number, since it uses less digits than its factorization.

251241205145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31901.

The product of its (nonzero) digits is 16000, while the sum is 32.

Adding to 251241205145 its reverse (541502142152), we get a palindrome (792743347297).

The spelling of 251241205145 in words is "two hundred fifty-one billion, two hundred forty-one million, two hundred five thousand, one hundred forty-five".