231021029 has 2 divisors, whose sum is σ = 231021030. Its totient is φ = 231021028.

The previous prime is 231021023. The next prime is 231021061. The reversal of 231021029 is 920120132.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 224250625 + 6770404 = 14975^2 + 2602^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-231021029 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 231021029.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (231021023) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115510514 + 115510515.

It is an arithmetic number, because the mean of its divisors is an integer number (115510515).

Almost surely, 2^231021029 is an apocalyptic number.

It is an amenable number.

231021029 is a deficient number, since it is larger than the sum of its proper divisors (1).

231021029 is an equidigital number, since it uses as much as digits as its factorization.

231021029 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 216, while the sum is 20.

The square root of 231021029 is about 15199.3759411365. The cubic root of 231021029 is about 613.5978623881.

The spelling of 231021029 in words is "two hundred thirty-one million, twenty-one thousand, twenty-nine".