231347621 has 2 divisors, whose sum is σ = 231347622. Its totient is φ = 231347620.

The previous prime is 231347617. The next prime is 231347651. The reversal of 231347621 is 126743132.

It is a happy number.

231347621 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 156525121 + 74822500 = 12511^2 + 8650^2 .

It is a cyclic number.

It is not a de Polignac number, because 231347621 - 2² = 231347617 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (231347651) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115673810 + 115673811.

It is an arithmetic number, because the mean of its divisors is an integer number (115673811).

Almost surely, 2^231347621 is an apocalyptic number.

It is an amenable number.

231347621 is a deficient number, since it is larger than the sum of its proper divisors (1).

231347621 is an equidigital number, since it uses as much as digits as its factorization.

231347621 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6048, while the sum is 29.

The square root of 231347621 is about 15210.1157457792. The cubic root of 231347621 is about 613.8868718568.

The spelling of 231347621 in words is "two hundred thirty-one million, three hundred forty-seven thousand, six hundred twenty-one".