121431231 has 12 divisors (see below), whose sum is σ = 181897352. Its totient is φ = 80953992.

The previous prime is 121431203. The next prime is 121431239. The reversal of 121431231 is 132134121.

121431231 is a `hidden beast` number, since 1 + 2 + 1 + 431 + 231 = 666.

It is not a de Polignac number, because 121431231 - 2⁵ = 121431199 is a prime.

It is a super-2 number, since 2×121431231² = 29491087724350722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121431239) 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, 249616 + ... + 250101.

Almost surely, 2^121431231 is an apocalyptic number.

121431231 is a deficient number, since it is larger than the sum of its proper divisors (60466121).

121431231 is an frugal number, since it uses more digits than its factorization.

121431231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 499732 (or 499720 counting only the distinct ones).

The product of its digits is 144, while the sum is 18.

The square root of 121431231 is about 11019.5839758132. The cubic root of 121431231 is about 495.1956251576.

Adding to 121431231 its reverse (132134121), we get a palindrome (253565352).

The spelling of 121431231 in words is "one hundred twenty-one million, four hundred thirty-one thousand, two hundred thirty-one".