251255211442 has 8 divisors (see below), whose sum is σ = 377061187356. Its totient is φ = 125568148992.

The previous prime is 251255211437. The next prime is 251255211469. The reversal of 251255211442 is 244112552152.

It can be written as a sum of positive squares in 2 ways, for example, as 221849478081 + 29405733361 = 471009^2 + 171481^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 251255211398 and 251255211407.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 29723083 + ... + 29731534.

Almost surely, 2^251255211442 is an apocalyptic number.

251255211442 is a deficient number, since it is larger than the sum of its proper divisors (125805975914).

251255211442 is a wasteful number, since it uses less digits than its factorization.

251255211442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59456732.

The product of its digits is 32000, while the sum is 34.

Adding to 251255211442 its reverse (244112552152), we get a palindrome (495367763594).

The spelling of 251255211442 in words is "two hundred fifty-one billion, two hundred fifty-five million, two hundred eleven thousand, four hundred forty-two".