121840831 has 8 divisors (see below), whose sum is σ = 141009920. Its totient is φ = 103112568.

The previous prime is 121840783. The next prime is 121840847. The reversal of 121840831 is 138048121.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 121840831 - 2¹⁷ = 121709759 is a prime.

It is a super-2 number, since 2×121840831² = 29690376197541122, which 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 121840831.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121840871) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 109611 + ... + 110716.

It is an arithmetic number, because the mean of its divisors is an integer number (17626240).

Almost surely, 2^121840831 is an apocalyptic number.

121840831 is a deficient number, since it is larger than the sum of its proper divisors (19169089).

121840831 is an equidigital number, since it uses as much as digits as its factorization.

121840831 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 220413.

The product of its (nonzero) digits is 1536, while the sum is 28.

The square root of 121840831 is about 11038.1534234672. The cubic root of 121840831 is about 495.7517821829.

Adding to 121840831 its reverse (138048121), we get a palindrome (259888952).

The spelling of 121840831 in words is "one hundred twenty-one million, eight hundred forty thousand, eight hundred thirty-one".