231220451 has 32 divisors (see below), whose sum is σ = 315809280. Its totient is φ = 163699200.

The previous prime is 231220421. The next prime is 231220453. The reversal of 231220451 is 154022132.

It is not a de Polignac number, because 231220451 - 2⁶ = 231220387 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (231220453) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 34916 + ... + 41006.

It is an arithmetic number, because the mean of its divisors is an integer number (9869040).

Almost surely, 2^231220451 is an apocalyptic number.

231220451 is a deficient number, since it is larger than the sum of its proper divisors (84588829).

231220451 is a wasteful number, since it uses less digits than its factorization.

231220451 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6155.

The product of its (nonzero) digits is 480, while the sum is 20.

The square root of 231220451 is about 15205.9347295719. The cubic root of 231220451 is about 613.7743682832.

Adding to 231220451 its reverse (154022132), we get a palindrome (385242583).

The spelling of 231220451 in words is "two hundred thirty-one million, two hundred twenty thousand, four hundred fifty-one".