263111125431 has 24 divisors (see below), whose sum is σ = 440693018752. Its totient is φ = 136681102800.

The previous prime is 263111125349. The next prime is 263111125439. The reversal of 263111125431 is 134521111362.

It is not a de Polignac number, because 263111125431 - 2²² = 263106931127 is a prime.

It is a super-3 number, since 3×263111125431³ (a number of 35 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (263111125439) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 51770605 + ... + 51775686.

Almost surely, 2^263111125431 is an apocalyptic number.

263111125431 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

263111125431 is a deficient number, since it is larger than the sum of its proper divisors (177581893321).

263111125431 is a wasteful number, since it uses less digits than its factorization.

263111125431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 103546323 (or 103546312 counting only the distinct ones).

The product of its digits is 4320, while the sum is 30.

Adding to 263111125431 its reverse (134521111362), we get a palindrome (397632236793).

The spelling of 263111125431 in words is "two hundred sixty-three billion, one hundred eleven million, one hundred twenty-five thousand, four hundred thirty-one".