251155201247 has 2 divisors, whose sum is σ = 251155201248. Its totient is φ = 251155201246.

The previous prime is 251155201229. The next prime is 251155201259. The reversal of 251155201247 is 742102551152.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 251155201247 - 2¹⁰ = 251155200223 is a prime.

It is a super-2 number, since 2×251155201247² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (251155201267) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 125577600623 + 125577600624.

It is an arithmetic number, because the mean of its divisors is an integer number (125577600624).

Almost surely, 2^251155201247 is an apocalyptic number.

251155201247 is a deficient number, since it is larger than the sum of its proper divisors (1).

251155201247 is an equidigital number, since it uses as much as digits as its factorization.

251155201247 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 28000, while the sum is 35.

Adding to 251155201247 its reverse (742102551152), we get a palindrome (993257752399).

The spelling of 251155201247 in words is "two hundred fifty-one billion, one hundred fifty-five million, two hundred one thousand, two hundred forty-seven".