251263034233 has 4 divisors (see below), whose sum is σ = 251265677940. Its totient is φ = 251260390528.

The previous prime is 251263034221. The next prime is 251263034263. The reversal of 251263034233 is 332430362152.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 47922463744 + 203340570489 = 218912^2 + 450933^2 .

It is a cyclic number.

It is not a de Polignac number, because 251263034233 - 2²⁵ = 251229479801 is a prime.

It is a super-2 number, since 2×251263034233² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (251263034263) 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, 1173760 + ... + 1371217.

It is an arithmetic number, because the mean of its divisors is an integer number (62816419485).

Almost surely, 2^251263034233 is an apocalyptic number.

It is an amenable number.

251263034233 is a deficient number, since it is larger than the sum of its proper divisors (2643707).

251263034233 is an equidigital number, since it uses as much as digits as its factorization.

251263034233 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2643706.

The product of its (nonzero) digits is 77760, while the sum is 34.

Adding to 251263034233 its reverse (332430362152), we get a palindrome (583693396385).

The spelling of 251263034233 in words is "two hundred fifty-one billion, two hundred sixty-three million, thirty-four thousand, two hundred thirty-three".