251123523135 has 16 divisors (see below), whose sum is σ = 402809731296. Its totient is φ = 133595180928.

The previous prime is 251123523121. The next prime is 251123523137. The reversal of 251123523135 is 531325321152.

It is a de Polignac number, because none of the positive numbers 2^k-251123523135 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 251123523096 and 251123523105.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (251123523137) 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, 21079144 + ... + 21091053.

It is an arithmetic number, because the mean of its divisors is an integer number (25175608206).

Almost surely, 2^251123523135 is an apocalyptic number.

251123523135 is a deficient number, since it is larger than the sum of its proper divisors (151686208161).

251123523135 is a wasteful number, since it uses less digits than its factorization.

251123523135 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42170602.

The product of its digits is 27000, while the sum is 33.

Adding to 251123523135 its reverse (531325321152), we get a palindrome (782448844287).

The spelling of 251123523135 in words is "two hundred fifty-one billion, one hundred twenty-three million, five hundred twenty-three thousand, one hundred thirty-five".