231554421 has 24 divisors (see below), whose sum is σ = 385180224. Its totient is φ = 131302080.

The previous prime is 231554419. The next prime is 231554431. The reversal of 231554421 is 124455132.

231554421 is a `hidden beast` number, since 231 + 5 + 5 + 4 + 421 = 666.

It is not a de Polignac number, because 231554421 - 2¹ = 231554419 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231554431) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5776 + ... + 22281.

It is an arithmetic number, because the mean of its divisors is an integer number (16049176).

Almost surely, 2^231554421 is an apocalyptic number.

231554421 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

231554421 is a deficient number, since it is larger than the sum of its proper divisors (153625803).

231554421 is a wasteful number, since it uses less digits than its factorization.

231554421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28201 (or 28198 counting only the distinct ones).

The product of its digits is 4800, while the sum is 27.

The square root of 231554421 is about 15216.9123346361. The cubic root of 231554421 is about 614.0697337570.

The spelling of 231554421 in words is "two hundred thirty-one million, five hundred fifty-four thousand, four hundred twenty-one".