231553109 has 2 divisors, whose sum is σ = 231553110. Its totient is φ = 231553108.

The previous prime is 231553099. The next prime is 231553123. The reversal of 231553109 is 901355132.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 227859025 + 3694084 = 15095^2 + 1922^2 .

It is a cyclic number.

It is not a de Polignac number, because 231553109 - 2¹⁶ = 231487573 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (231553129) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115776554 + 115776555.

It is an arithmetic number, because the mean of its divisors is an integer number (115776555).

Almost surely, 2^231553109 is an apocalyptic number.

It is an amenable number.

231553109 is a deficient number, since it is larger than the sum of its proper divisors (1).

231553109 is an equidigital number, since it uses as much as digits as its factorization.

231553109 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4050, while the sum is 29.

The square root of 231553109 is about 15216.8692246467. The cubic root of 231553109 is about 614.0685739706.

The spelling of 231553109 in words is "two hundred thirty-one million, five hundred fifty-three thousand, one hundred nine".