231021061 has 2 divisors, whose sum is σ = 231021062. Its totient is φ = 231021060.

The previous prime is 231021029. The next prime is 231021103. The reversal of 231021061 is 160120132.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 165508225 + 65512836 = 12865^2 + 8094^2 .

It is a cyclic number.

It is not a de Polignac number, because 231021061 - 2⁵ = 231021029 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (231021761) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115510530 + 115510531.

It is an arithmetic number, because the mean of its divisors is an integer number (115510531).

Almost surely, 2^231021061 is an apocalyptic number.

It is an amenable number.

231021061 is a deficient number, since it is larger than the sum of its proper divisors (1).

231021061 is an equidigital number, since it uses as much as digits as its factorization.

231021061 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 72, while the sum is 16.

The square root of 231021061 is about 15199.3769938113. The cubic root of 231021061 is about 613.5978907191.

Adding to 231021061 its reverse (160120132), we get a palindrome (391141193).

The spelling of 231021061 in words is "two hundred thirty-one million, twenty-one thousand, sixty-one".