121393831 has 12 divisors (see below), whose sum is σ = 137979912. Its totient is φ = 106154064.

The previous prime is 121393829. The next prime is 121393847. The reversal of 121393831 is 138393121.

It is not a de Polignac number, because 121393831 - 2¹ = 121393829 is a prime.

It is a super-2 number, since 2×121393831² = 29472924409713122, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 121393793 and 121393802.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121393801) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8241 + ... + 17626.

It is an arithmetic number, because the mean of its divisors is an integer number (11498326).

Almost surely, 2^121393831 is an apocalyptic number.

121393831 is a deficient number, since it is larger than the sum of its proper divisors (16586081).

121393831 is a wasteful number, since it uses less digits than its factorization.

121393831 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25918 (or 25899 counting only the distinct ones).

The product of its digits is 3888, while the sum is 31.

The square root of 121393831 is about 11017.8868663642. The cubic root of 121393831 is about 495.1447809667.

The spelling of 121393831 in words is "one hundred twenty-one million, three hundred ninety-three thousand, eight hundred thirty-one".