831257121400 has 24 divisors (see below), whose sum is σ = 1932672807720. Its totient is φ = 332502848480.

The previous prime is 831257121377. The next prime is 831257121413. The reversal of 831257121400 is 4121752138.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2078142604 + ... + 2078143003.

It is an arithmetic number, because the mean of its divisors is an integer number (80528033655).

Almost surely, 2^831257121400 is an apocalyptic number.

It is an amenable number.

831257121400 is an abundant number, since it is smaller than the sum of its proper divisors (1101415686320).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

831257121400 is a wasteful number, since it uses less digits than its factorization.

831257121400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4156285623 (or 4156285614 counting only the distinct ones).

The product of its (nonzero) digits is 13440, while the sum is 34.

Adding to 831257121400 its reverse (4121752138), we get a palindrome (835378873538).

The spelling of 831257121400 in words is "eight hundred thirty-one billion, two hundred fifty-seven million, one hundred twenty-one thousand, four hundred".