787491553831 has 4 divisors (see below), whose sum is σ = 787493330064. Its totient is φ = 787489777600.

The previous prime is 787491553781. The next prime is 787491553841. The reversal of 787491553831 is 138355194787.

787491553831 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 138355194787 = 1471 ⋅94055197.

It is a cyclic number.

It is not a de Polignac number, because 787491553831 - 2⁹ = 787491553319 is a prime.

It is a super-2 number, since 2×787491553831² (a number of 25 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 787491553831.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (787491553841) 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, 390846 + ... + 1314436.

It is an arithmetic number, because the mean of its divisors is an integer number (196873332516).

Almost surely, 2^787491553831 is an apocalyptic number.

787491553831 is a deficient number, since it is larger than the sum of its proper divisors (1776233).

787491553831 is an equidigital number, since it uses as much as digits as its factorization.

787491553831 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1776232.

The product of its digits is 25401600, while the sum is 61.

The spelling of 787491553831 in words is "seven hundred eighty-seven billion, four hundred ninety-one million, five hundred fifty-three thousand, eight hundred thirty-one".