231861029 has 2 divisors, whose sum is σ = 231861030. Its totient is φ = 231861028.

The previous prime is 231861023. The next prime is 231861037. The reversal of 231861029 is 920168132.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 210192004 + 21669025 = 14498^2 + 4655^2 .

It is a cyclic number.

It is not a de Polignac number, because 231861029 - 2⁴ = 231861013 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 231860986 and 231861004.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (231861023) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115930514 + 115930515.

It is an arithmetic number, because the mean of its divisors is an integer number (115930515).

Almost surely, 2^231861029 is an apocalyptic number.

It is an amenable number.

231861029 is a deficient number, since it is larger than the sum of its proper divisors (1).

231861029 is an equidigital number, since it uses as much as digits as its factorization.

231861029 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5184, while the sum is 32.

The square root of 231861029 is about 15226.9835817866. The cubic root of 231861029 is about 614.3406501308.

The spelling of 231861029 in words is "two hundred thirty-one million, eight hundred sixty-one thousand, twenty-nine".