231055621 has 2 divisors, whose sum is σ = 231055622. Its totient is φ = 231055620.

The previous prime is 231055603. The next prime is 231055681. The reversal of 231055621 is 126550132.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 226171521 + 4884100 = 15039^2 + 2210^2 .

It is a cyclic number.

It is not a de Polignac number, because 231055621 - 2²³ = 222667013 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (231055681) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115527810 + 115527811.

It is an arithmetic number, because the mean of its divisors is an integer number (115527811).

Almost surely, 2^231055621 is an apocalyptic number.

It is an amenable number.

231055621 is a deficient number, since it is larger than the sum of its proper divisors (1).

231055621 is an equidigital number, since it uses as much as digits as its factorization.

231055621 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1800, while the sum is 25.

The square root of 231055621 is about 15200.5138399990. The cubic root of 231055621 is about 613.6284866103.

The spelling of 231055621 in words is "two hundred thirty-one million, fifty-five thousand, six hundred twenty-one".