631808527234091 has 4 divisors (see below), whose sum is σ = 631819540740432. Its totient is φ = 631797513727752.

The previous prime is 631808527234033. The next prime is 631808527234127. The reversal of 631808527234091 is 190432725808136.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-631808527234091 is a prime.

It is a super-2 number, since 2×631808527234091² (a number of 30 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 631808527234091.

It is not an unprimeable number, because it can be changed into a prime (631808527236091) 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, 5506667120 + ... + 5506781853.

It is an arithmetic number, because the mean of its divisors is an integer number (157954885185108).

It is a 1-persistent number, because it is pandigital, but 2⋅631808527234091 = 1263617054468182 is not.

Almost surely, 2^{631808527234091} is an apocalyptic number.

631808527234091 is a deficient number, since it is larger than the sum of its proper divisors (11013506341).

631808527234091 is a wasteful number, since it uses less digits than its factorization.

631808527234091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11013506340.

The product of its (nonzero) digits is 17418240, while the sum is 59.

The spelling of 631808527234091 in words is "six hundred thirty-one trillion, eight hundred eight billion, five hundred twenty-seven million, two hundred thirty-four thousand, ninety-one".