251155201305 has 16 divisors (see below), whose sum is σ = 411193632960. Its totient is φ = 130834337088.

The previous prime is 251155201301. The next prime is 251155201309. The reversal of 251155201305 is 503102551152.

It is an interprime number because it is at equal distance from previous prime (251155201301) and next prime (251155201309).

It is not a de Polignac number, because 251155201305 - 2² = 251155201301 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (251155201301) 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, 194693310 + ... + 194694599.

It is an arithmetic number, because the mean of its divisors is an integer number (25699602060).

Almost surely, 2^251155201305 is an apocalyptic number.

It is an amenable number.

251155201305 is a deficient number, since it is larger than the sum of its proper divisors (160038431655).

251155201305 is a wasteful number, since it uses less digits than its factorization.

251155201305 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 389387960.

The product of its (nonzero) digits is 7500, while the sum is 30.

Adding to 251155201305 its reverse (503102551152), we get a palindrome (754257752457).

The spelling of 251155201305 in words is "two hundred fifty-one billion, one hundred fifty-five million, two hundred one thousand, three hundred five".