231147621 has 16 divisors (see below), whose sum is σ = 351697600. Its totient is φ = 149932944.

The previous prime is 231147619. The next prime is 231147641. The reversal of 231147621 is 126741132.

231147621 is a `hidden beast` number, since 2 + 31 + 1 + 4 + 7 + 621 = 666.

It is not a de Polignac number, because 231147621 - 2¹ = 231147619 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231147611) 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 15 ways as a sum of consecutive naturals, for example, 114691 + ... + 116688.

It is an arithmetic number, because the mean of its divisors is an integer number (21981100).

Almost surely, 2^231147621 is an apocalyptic number.

It is an amenable number.

231147621 is a deficient number, since it is larger than the sum of its proper divisors (120549979).

231147621 is a wasteful number, since it uses less digits than its factorization.

231147621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 231425 (or 231419 counting only the distinct ones).

The product of its digits is 2016, while the sum is 27.

The square root of 231147621 is about 15203.5397523077. The cubic root of 231147621 is about 613.7099191378.

Adding to 231147621 its reverse (126741132), we get a palindrome (357888753).

The spelling of 231147621 in words is "two hundred thirty-one million, one hundred forty-seven thousand, six hundred twenty-one".