231212057 has 2 divisors, whose sum is σ = 231212058. Its totient is φ = 231212056.

The previous prime is 231211961. The next prime is 231212071. The reversal of 231212057 is 750212132.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 170668096 + 60543961 = 13064^2 + 7781^2 .

It is a cyclic number.

It is not a de Polignac number, because 231212057 - 2¹⁶ = 231146521 is a prime.

It is not a weakly prime, because it can be changed into another prime (231242057) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115606028 + 115606029.

It is an arithmetic number, because the mean of its divisors is an integer number (115606029).

Almost surely, 2^231212057 is an apocalyptic number.

It is an amenable number.

231212057 is a deficient number, since it is larger than the sum of its proper divisors (1).

231212057 is an equidigital number, since it uses as much as digits as its factorization.

231212057 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 840, while the sum is 23.

The square root of 231212057 is about 15205.6587164121. The cubic root of 231212057 is about 613.7669409062.

Adding to 231212057 its reverse (750212132), we get a palindrome (981424189).

The spelling of 231212057 in words is "two hundred thirty-one million, two hundred twelve thousand, fifty-seven".